MAINSTREET BANKGROUP INC
8-K, 1997-08-05
STATE COMMERCIAL BANKS
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                            UNITED STATES
                 SECURITIES AND EXCHANGE COMMISSION
                       Washington, D.C.  20549

                       _______________________

                              FORM 8-K
                                 
                           CURRENT REPORT

               Pursuant to Section 13 or 15 (d) of the
                     Securities Exchange Act of 1934

    Date of Report (Date of earliest event reported): July 25, 1997

                  MAINSTREET BANKGROUP INCORPORATED

________________________________________________________________________
              (Exact name of as specified in charter)

   Virginia                     0-8622                       54-1046817
________________            ______________               _______________
(State or other              (Commission                 (IRS Employer
jurisdiction of                File Number)              Identification No.)
incorporation)

             P.O. BOX 4831, Martinsville, VA  24115-4831
_________________________________________________________________________
              (Address of principal executive offices)   (Zip Code)

       Registrant's telephone number, including area code:   (540) 666-6724


                                  1
<PAGE>


Item 5.    Other Events

     This current report on Form 8-K is filed by MainStreet BankGroup 
Incorporated ("Registrant") to report Registrant's agreement to acquire 
Tysons Financial Corporation ("Tysons"), subject to regulatory approval and
approval by the shareholders of Tysons and certain other specified 
conditions.  Under terms of the agreement, Registrant has agreed to pay the
equivalent of $14.50 per share for each outstanding share of Tysons common
stock in the form of MainStreet common stock, subject to adjustment under
certain conditions.  Registrant has agreed to exchange a maximum of .620 and
a minimum of .507 shares of its Common Stock for each share purchased of
Tysons' 1,071,119 shares of Common Stock.  In addition, MainStreet has agreed
to purchase Tysons' outstanding 228,250 directors' warrants for the 
difference between the exercise price per warrant and $14.50 in the form of
MainStreet common stock, resulting in a maximum exchange ratio of .192
shares and a minimum exchange ratio of .157 shares per warrant purchased.
Also, MainStreet has agreed to purchase Tysons' outstanding 97,780
directors' options for the difference between the exercise price per option
and $14.50 in the form of MainStreet commmon stock, resulting in a maximum
exchange ratio of .30 shares and a minimum exchange ratio of .07 shares per
option purchased.  If the maximum exchange ratios are used, 736,607 shares 
of Registrant's Common Stock will be issued in the transaction.  MainStreet
has also agreed to assume the outstanding employee stock options of Tysons.  
The purchase price of this transaction is valued at approximately
$17 million.  At June 30, 1997, Registrant had 11,396,576 shares of Common
Stock outstanding.

     Tysons was organized under the laws of Virginia in McLean, and serves
the Northern Virginia and greater Washington, D.C. region with four offices.
At June 30, 1997, Tysons reported total assets of $86.2 million.

     Registrant is a multi-community bank holding company headquartered in
Martinsville, Virginia.  It owns eight community banks (35 offices), and
one nonbanking subsidiary, chartered as a limited purpose national banking
association, with total second quarter assets of $1.4 billion and a pending
affiliation with Commerce Bank, College Park, Maryland, who had second
quarter assets of $74.5 million.  Registrant currently serves the following
markets: City of Martinsville and Henry County; the City of Galax, Town
of Hillsville and Carroll and Grayson Counties; the Towns of Ferrum and
Rocky Mount and Franklin County; the Town of Forest, City of Lynchburg and
Bedford, Campbell and Amherst Counties; the Town of Stuart and Patrick 
County; the Towns of Saltville and Chilhowie and Smyth County; the City of
Clifton Forge and Alleghany County; the Towns of Ashland and Mechanicsville
and the Counties of Hanover and Henrico, Virginia and contiguous areas.

                                2
<PAGE>

Item 7(c).  Exhibits

(2) Agreement and Plan of Merger


                               Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

                               MAINSTREET BANKGROUP INCORPORATED


              
Date: August 4, 1997           /S/ James E. Adams,
                               Chief Financial Officer, Executive Vice
                               President, Treasurer       


                                3
<PAGE>


                   	AGREEMENT AND PLAN OF MERGER

     AGREEMENT AND PLAN OF MERGER, dated as of the 25th day of 
July, 1997 (this "Plan"), by and among MainStreet BankGroup 
Incorporated, a Virginia corporation ("MSBC"), and Tysons 
dFinancial Corporation, a Virginia corporation ("Tysons").

	                              RECITALS:

     (A)  MSBC.  MSBC is a corporation duly organized and 
existing in good standing under the laws of the Commonwealth of 
Virginia, with its principal executive offices located in 
Martinsville, Virginia.  As of the date hereof, MSBC has 
20,000,000 authorized shares of Common Stock, each of $5.00 par 
value ("MSBC Common Stock"), and 1,000,000 authorized shares of 
Preferred Stock, each of $5.00 par value ("MSBC Preferred Stock") 
(no other class of capital stock being authorized), of which 
11,373,417 shares of MSBC Common Stock and no shares of MSBC 
Preferred Stock, respectively, are issued and outstanding as of 
June 30, 1997.  MSBC has eight (8) wholly owned bank 
subsidiaries: Piedmont Trust Bank, a Virginia bank; Bank of 
Ferrum, a Virginia bank; Bank of Carroll, a Virginia bank; First 
Community Bank, a Virginia bank; The First Bank of Stuart, a 
Virginia bank; First Community Bank of Saltville, a Virginia 
bank; Hanover Bank, a Virginia bank; and First National Bank of 
Clifton Forge, a national banking association (each of which is 
referred to as a "MSBC Bank Subsidiary" and all of which are 
referred to as "MSBC Bank Subsidiaries").  In addition, MSBC has 

                                  4
<PAGE>


one wholly owned nonbanking subsidiary, MainStreet Trust Company 
chartered as a limited purpose national banking association to 
engage in the business of a trust company and businesses 
incidental thereto ("MSBC Trust Subsidiary") and one corporation, 
MB Corp. (the "Holding Company"), incorporated under Virginia 
law, which will become a wholly owned subsidiary of MSBC.  The 
MSBC Bank Subsidiaries, MSBC Trust Subsidiary and the Holding 
Company (upon formation) are individually referred to as an "MSBC 
Subsidiary" and collectively as "MSBC Subsidiaries".

     (B)  Tysons.  Tysons is a corporation duly organized and 
existing in good standing under the laws of the Commonwealth of 
Virginia, with its principal executive offices located at 8200 
Greensboro Drive, Suite 100, McLean, Virginia and is authorized 
to do business as a bank holding company under the federal Bank 
Holding Company Act of 1956, as amended, and Chapter 13 of the 
Virginia Banking Act.  Tysons' only subsidiary is Tysons National 
Bank ("TNB").  TNB is a national banking association organized 
under the laws of the United States.  As of the date hereof, 
Tysons has 10,000,000 authorized shares of Common Stock, each of 
$5.00 par value ("Tysons Common Stock"), of which 1,071,119 
shares were issued and outstanding as of June 30, 1997 (no other 
class of capital stock being authorized) and warrants to purchase 
up to 228,250 shares of Tysons Common Stock at $10.00 per share, 
which expire on July 1, 2001, if unexercised, of which 228,250 
are outstanding as of the date of this Agreement ("Tysons 

                                  5
<PAGE>


Warrants").  The holders of Tysons Common Stock have no 
preemptive rights. Tysons Common Stock is subject to the 
provisions of Section 12, 13, 14(a), 14(c), 14(d), 15(d) and 16 
of the Securities Exchange Act of 1934, as amended, (together 
with the rules and regulations of the Securities and Exchange 
Commission ("SEC") promulgated thereunder, the "Exchange Act").

     (C)  The Holding Company.  The Holding Company is a 
corporation duly organized and existing in good standing under 
the laws of the Commonwealth of Virginia, having 5,000 authorized 
shares of common stock, no par value ("Holding Company Common 
Stock") (no other class of capital stock being authorized) of 
which as of the Merger Closing 1,000 shares will be issued and 
outstanding, all of which shall be held of record and 
beneficially by MSBC.

     (D)  TNB.	 TNB is a wholly owned subsidiary of Tysons.  TNB's 
headquarters are located at 8200 Greensboro Drive, Suite 100, 
McLean, Virginia 22102.  TNB has 10,000,000 shares of common 
stock, $5.00 par value per share ("TNB Common Stock") authorized 
(no other class of capital stock being authorized), of which 
575,000 shares are issued and outstanding as of June 30, 1997, 
and are held of record and beneficially by Tysons.  There are no 
shares of TNB Common Stock authorized and reserved for issuance 
and there is no commitment to authorize, issue or sell any such 
shares or any other securities, warrants or obligations 
convertible into or exchangeable for, or giving any right to 

                                  6
<PAGE>


subscribe for or acquire any such shares and no securities, 
warrants or obligations representing any such rights are 
outstanding.  There are no options or share appreciation rights 
authorized or granted for TNB Common Stock and no commitment to 
grant any such options or share appreciation rights.

     With respect to Tysons, any reference herein to "Subsidiary" 
or "Subsidiaries" refers to TNB and, with respect to MSBC, any 
reference to "Subsidiary" refers to any MSBC Subsidiary and to 
"Subsidiaries" refers to the MSBC Subsidiaries, jointly and 
severally (unless the context otherwise requires). 

     (E)  Rights, Etc.  Except as Previously Disclosed or except 
in connection with the transactions contemplated by this Plan, 
there are no shares of MSBC Common Stock or MSBC Preferred Stock 
authorized and reserved for issuance, and MSBC has no commitment 
to authorize, issue or sell any such shares or any securities or 
obligations convertible into or exchangeable for, or giving any 
person any right to subscribe for or acquire from MSBC, any such 
shares and no securities or obligations representing any such 
rights are outstanding.  Except as Previously Disclosed, MSBC has 
not granted or made any commitment to grant any options or share 
appreciation rights with respect to the MSBC Common Stock or MSBC 
Preferred Stock.  Except as Previously Disclosed and except for 
shares reserved pursuant to the Stock Option Agreement (as 
hereinafter defined) and the Tysons Warrants, there are no shares 
of Tysons Common Stock authorized and reserved for issuance and 

                                  7
<PAGE>


Tysons has no commitment to authorize, issue or sell any such 
shares, or any other securities, warrants or obligations 
convertible into or exchangeable for, or giving any right to 
subscribe for or acquire from Tysons any such shares, and no 
securities, warrants or obligations representing any such rights 
are outstanding. Except for options granted to employees and 
officers in such capacity to purchase Tysons Common Stock 
("ISO's") and options granted to directors in such capacity to 
purchase Tysons' Common Stock ("Directors Options"), all as 
Previously Disclosed, Tysons has not granted or made any 
commitment to grant any options or share appreciation rights with 
respect to Tysons Common Stock.  The ISO's and Directors Options 
are collectively referred to as the "Tysons Options". 

     (F)  This Transaction.  The Boards of Directors of MSBC and 
Tysons, respectively, deem it advisable and in the best interests 
of MSBC and Tysons and their stockholders that Tysons be acquired 
by MSBC through a merger of Holding Company into Tysons pursuant 
to this Agreement and Plan of Merger. 

     (G)  Stock Option Agreement.  As a condition and inducement 
to MSBC's willingness to enter into this Plan, Tysons has agreed 
that prior to 5:00 p.m., on July 25, 1997, Tysons shall enter 
into a Stock Option Agreement with MSBC ("Stock Option 
Agreement") in the form attached hereto as Exhibit E pursuant to 
which Tysons shall grant to MSBC an option ("Option") to 

                                 8
<PAGE>


purchase, under certain circumstances, shares of Tysons Common 
Stock. 

     (H)  Approvals.  The Board of Directors of each of MSBC and 
Tysons has approved and adopted, at meetings of each of such 
Board of Directors, this Plan and the Stock Option Agreement and 
has authorized, subject to such further modifications as may be 
agreed by a member of the Office of the Chairman of MSBC and by 
the President of Tysons, respectively, not inconsistent herewith, 
the execution hereof in counterparts.  At the meeting of the 
Tysons Board of Directors, the Board of Directors of Tysons 
recommended the Plan as so executed to its shareholders.

     (I)  NASDAQ.  Trading of the MSBC Common Stock is presently 
reported on the National Association of Securities Dealers 
("NASD") Quotations System National Market System("NASDAQ/NMS"). 
Trading of the Tysons Common Stock is presently reflected on 
NASD's Small Cap Market ("NASD/SCM").  The Tysons Warrants and 
the Tysons Options are not traded on any established market.

     (J)  Benefits of Plan.  MSBC and Tysons believe the Plan and 
its consummation are in the respective best interests of each 
corporation and its shareholders for the following reasons, among 
others:  (1) the Merger will allow them to provide banking and 
related financial services more effectively and efficiently; (2) 
the Merger will expand the range of banking and related financial 
services which they can provide; (3) the Merger will enhance the 
safety and soundness of their operations; (4) the Merger will 

                                  9
<PAGE>


enable them to expand the market for their banking and related 
financial services; (5) the Merger will expand the number and 
diversity of Tysons' shareholder base and enhance the liquidity 
of equity investments in Tysons; and (6) no gain or loss 
generally will be recognized by stockholders of Tysons who 
receive shares of MSBC Common Stock in exchange for their shares 
of Tysons Common Stock.

     NOW, THEREFORE, in consideration of their mutual promises 
and obligations, the parties hereto adopt and make this Plan and 
prescribe the terms and conditions thereof and the manner and 
basis of carrying it into effect, which shall be as follows:


                           I.  THE MERGER

     (A)  The Continuing Corporation.  On the Merger Effective 
Date (as hereinafter defined), the Holding Company shall merge 
into Tysons (the "Merger"), the separate existence of the Holding 
Company shall cease and Tysons (the "Continuing Corporation") 
shall survive.

     (B)  Rights, Etc.  Upon consummation of the Merger, the 
Continuing Corporation shall thereupon and thereafter possess all 
of the rights, privileges, immunities and franchises, of a public 
as well as of a private nature, of each of the merging 
corporations; and all property, real, personal and mixed, and all 
debts due on whatever account, and all other choses in action, 
and all and every other interest, of or belonging to or due to 

                                  10
<PAGE>


each of the corporations so merged, shall be deemed to be vested 
in the Continuing Corporation without further act or deed; and 
the title to any real estate or any interest therein, vested in 
any of such corporations, shall not revert or be in any way 
impaired by reason of the Merger as provided by the laws of the 
Commonwealth of Virginia.

     (C)  Liabilities.  Upon consummation of the Merger, the 
Continuing Corporation shall thenceforth be responsible and 
liable for all the liabilities, obligations and penalties of each 
of the corporations so merged.

     (D)  Articles of Incorporation; Bylaws; Directors; Officers 
of Continuing Corporation.  The Articles of Incorporation of the 
Continuing Corporation shall be those of the Holding Company, and 
the Bylaws of the Continuing Corporation shall be those of the 
Holding Company. The officers and directors of Tysons in office 
immediately prior to the Merger becoming effective shall be the 
officers and directors of the Continuing Corporation, who shall 
hold office until such time as their successors are elected and 
qualified in accordance with the Articles and Bylaws of the 
Continuing Corporation.  

     (E)  Merger Closing; Merger Effective Date.  The Merger 
shall become effective on the date and time the Virginia State 
Corporation Commission ("Virginia Corporation Authority") issues 
a certificate of merger reflecting the Merger (the "Merger 
Effective Date").  Unless otherwise agreed upon in writing by the 

                                  11
<PAGE>


chief executive officers of MSBC and Tysons, subject to the 
conditions to the obligations of the parties to effect the Merger 
as set forth in Article VI, the parties shall use their 
reasonable efforts to cause the Merger Effective Date to occur on 
an end of the month date as soon as practicable following the 
satisfaction of the conditions set forth in Paragraphs (A), (B) 
and (C) of Article VI but in no event before December 31, 1997.  
All documents required by the terms of this Agreement to be 
delivered at or prior to consummation of the Merger will be 
exchanged by the parties at the closing of the Merger (the 
"Merger Closing"), which shall be held on such date as MSBC shall 
designate to Tysons and which is reasonably acceptable to Tysons 
after the satisfaction of the condition set forth in Paragraphs 
(A), (B) and (C) of Article VI but no later than the Merger 
Effective Date.  Prior to the Merger Closing, Holding Company and 
Tysons shall execute and deliver to the Virginia Corporation 
Authority, Articles of Merger containing a Plan of Merger in 
substantially the form of Exhibit A hereto (the "Plan of Merger") 
for approval.


                     	II.  MERGER CONSIDERATION

     (A)  Outstanding Holding Company Common Stock.  The shares 
of Holding Company Common Stock issued and outstanding 
immediately prior to the Merger Effective Date, on and after the 
Merger Effective Date, shall be converted automatically into that 
number of shares of common stock of the Continuing Corporation 
issued and outstanding immediately prior to the Merger Effective 
Date and shall constitute the only issued and outstanding shares 
of common stock of the Continuing Corporation.

                                  12
<PAGE>


     (B)  Outstanding MSBC Common Stock.  The shares of MSBC 
Common Stock issued and outstanding immediately prior to the 
Merger Effective Date shall, on and after the Merger Effective 
Date, remain issued and outstanding shares of MSBC Common Stock.

     (C)  Outstanding Tysons Common Stock.  Each share (excluding 
shares held by Tysons or by MSBC or by any of the MSBC 
Subsidiaries, in each case other than in a fiduciary capacity or 
as a result of debts previously contracted (the "Excluded 
Shares")) of Tysons Common Stock issued and outstanding 
immediately prior to the Merger Effective Date shall, by virtue 
of the Merger, automatically and without any action on the part 
of the holder thereof on the Merger Effective Date, become and be 
converted into the right to receive that number of shares of MSBC 
Common Stock obtained by dividing the Negotiated Price per Tysons 
Common Share by the average of the bid/asked price per share for 
MSBC Common Stock ("Average MSBC Share Price") as reported on the 
NASDAQ/NMS for each of the twenty (20) trading days preceding the 
later to occur of (i) the shareholder approvals contemplated by 
Paragraph A of Article VI and (ii) the financial institutions 
regulatory approvals (but not the associated statutory waiting 
periods) contemplated by Paragraph B of Article VI.  If the 
Exchange Ratio computed in accordance with the immediately 

                                  13
<PAGE>


preceding sentence is less than .507, the Exchange Ratio shall be 
 .507, and if the Exchange Ratio computed in accordance with the 
immediately preceding sentence is greater than .620, the Exchange 
Ratio shall be .620 ("Exchange Ratio"). The Negotiated Price per 
Tysons Common Share is $14.50.

     (D)  Stockholder Rights; Stock Transfers.  On the Merger 
Effective Date, holders of Tysons Common Stock shall cease to be, 
and shall have no rights as, stockholders of Tysons other than to 
receive the Merger consideration provided under Paragraph (C) 
above.  After the Merger Effective Date, there shall be no 
transfers on the stock transfer books of Tysons or the Continuing 
Corporation of the shares of Tysons Common Stock which were 
issued and outstanding immediately prior to the Merger becoming 
effective.

     (E)  Fractional Shares.  Notwithstanding any other provision 
hereof, no fractional shares of MSBC Common Stock and no 
certificates or scrip therefor, or other evidence of ownership 
thereof, will be issued in the Merger; instead, MSBC shall pay to 
each holder of Tysons Common Stock who would otherwise be 
entitled to a fractional share an amount in cash determined by 
multiplying such fractional share by the Average MSBC Share 
Price.

     (F)  Exchange Procedures.  As promptly as practicable after 
the Merger Effective Date, MSBC shall send or cause to be sent to 
each former stockholder of Tysons of record immediately prior to 

                                  14
<PAGE>


the Merger Effective Date transmittal materials for use in 
exchanging such stockholder's certificates of Tysons for the 
consideration set forth in Paragraph (C) above.  Any fractional 
share checks which a Tysons stockholder shall be entitled to 
receive in exchange for such stockholder's shares of Tysons 
Common Stock, and any dividends paid on any shares of MSBC Common 
Stock, that such stockholder shall be entitled to receive prior 
to the delivery to MSBC of such stockholder's certificates 
representing all of such stockholder's shares of Tysons Common 
Stock will be delivered to such stockholder only upon delivery to 
MSBC of the certificates representing all of such shares (or 
indemnity satisfactory to MSBC, in its judgment, if any of such 
certificates are lost, stolen or destroyed).  No interest will be 
paid on any such fractional share checks or dividends which the 
holder of such shares shall be entitled to receive upon such 
delivery.  After the Merger Effective Date, to the extent 
permitted by law, former stockholders of record of Tysons shall 
be entitled to vote at any meeting of holders of MSBC Common 
Stock, the number of whole shares of MSBC Common Stock into which 
their respective shares of Tysons Common Stock are converted, 
regardless of whether such holders have exchanged their 
certificates representing Tysons Common Stock for certificates 
representing MSBC Common Stock in accordance with the provisions 
of this Plan.

                                  15
<PAGE>


     (G)  Shares Held by Tysons or MSBC.  Each of the shares of 
Tysons Common Stock and any Tysons Warrants held by Tysons, TNB, 
MSBC or any MSBC Subsidiary, in each case other than in a 
fiduciary capacity or as a result of debts previously contracted, 
shall be canceled and retired at the Merger Effective Date and no 
consideration shall be issued in exchange therefor.

      (H)  Anti-Dilution Provisions.  In the event MSBC changes 
the number of shares of MSBC Common Stock issued and outstanding 
prior to the Merger Effective Date as a result of a stock split, 
stock dividend, recapitalization or similar transaction with 
respect to the outstanding MSBC Common Stock (but not including 
shares issued in connection with a merger, share exchange or 
similar transaction) and the record date therefor shall be prior 
to the Merger Effective Date, the Exchange Ratio shall be 
proportionately adjusted.

     (I)  Dividends.  Tysons shareholders shall not under any 
circumstances be entitled to any dividend (cash or otherwise) 
declared by MSBC with a record date prior to the Merger Effective 
Date.

     (J)  ISO's and Stock Appreciation Rights.  From and after 
the Merger Effective Date, all ISO's to purchase shares of Tysons 
Common Stock which are then outstanding and unexercised, shall be 
converted into and become options with respect to MSBC Common 
Stock, and MSBC shall assume each such option and right, in 
accordance with the terms of the plan and agreement by which it 

                                  16
<PAGE>


is evidenced.  From and after the Merger Effective Date, (i) each 
such ISO assumed by MSBC may be exercised solely for shares of 
MSBC Common Stock, (ii) the number of shares of MSBC Common Stock 
subject to each ISO shall be equal to the number of shares of 
Tysons Common Stock subject to such ISO immediately prior to the 
Merger Effective Date multiplied by the Exchange Ratio, and (iii) 
the per share exercise price under each such ISO shall be 
adjusted by dividing the per share exercise price of each such 
ISO by the Exchange Ratio, and rounding to the nearest cent.  The 
maximum number of shares of Tysons Common Stock which are 
issuable upon exercise of such ISO's as of the date hereof are 
Previously Disclosed.  No stock appreciation rights are 
outstanding and unexercised as of the date hereof.


                    III.  ACTIONS PENDING MERGER

A.  Tysons Actions.  Without the prior written consent or 
approval of a proper officer of MSBC, Tysons will not and will 
cause its Subsidiary not to:

     (1)  Stock Distributions.  Make, declare or pay any dividend 
other than cash dividends on Tysons Common Stock or TNB Common 
Stock, as the case may be, consistent with past practice and in 
an amount not greater than the last previous cash dividend paid 
prior hereto by Tysons or TNB, respectively, or declare or make 
any distribution on, or directly or indirectly combine, redeem, 
reclassify, purchase or otherwise acquire, any shares of its 

                                  17
<PAGE>


capital stock (other than in a fiduciary capacity in the ordinary 
course of its business and consistent with past practice or in 
connection with stock received on a debt previously contracted 
basis) or authorize the creation or issuance of, or issue (except 
as may be required to comply with Tysons' obligations under the 
Tysons Warrants or Tysons Options), any additional shares of it 
capital stock, or any options, calls, warrants or commitments 
relating to its capital stock or any securities or obligations 
convertible into or exchangeable for, or giving any person any 
right to subscribe for or acquire from its shares of its capital 
stock or any securities or obligations convertible into or 
exchangeable for shares of its capital stock, or issue any long-
term debt;

     (2)  Employment Contracts.  Enter into any employment 
contracts with, increase the rate of compensation of (except in 
accordance with existing policy consistent with past practice or 
pursuant to any agreement existing and as in effect on the date 
hereof and Previously Disclosed), or pay or agree to pay any 
bonus to, any of its directors, officers or employees, except in 
accordance with plans or agreements existing and as in effect on 
the date hereof and Previously Disclosed;

     (3)  Employee Benefit Plans.  Enter into or modify (except 
as may be required by applicable law to change the voting 
provisions of the Tysons Financial Corporation Employee Stock 
Ownership Plan ("Tysons ESOP") to comply with the provisions of 

                                 18
<PAGE>


this Agreement) any pension, retirement, stock option, stock 
purchase, savings, profit sharing, deferred compensation, 
consulting, bonus, group insurance or other employee benefit, 
incentive or welfare contract, plan or arrangement, or any trust 
agreement related thereto, in respect of any of its directors, 
officers or other employees, including without limitation taking 
any action that accelerates (1) the vesting or exercise of any 
benefits payable thereunder, or (2) the right to exercise any 
employee stock options or stock appreciation rights outstanding 
thereunder;

     (4)  Asset Disposition.  Dispose of, grant an encumbrance 
against or discontinue any portion of its assets, business 
operations or properties, which is material to Tysons or TNB or 
merge or consolidate with, or acquire all or any substantial 
portion of, the business or property of any other entity (except 
foreclosures, acquisitions of control in its fiduciary capacity 
or securitization transactions, in each case in the ordinary 
course of business consistent with past practice);

     (5)  Constituent Documents.  Amend its Articles of 
Incorporation or Bylaws as delivered to MSBC in connection with 
this Plan; 

     (6)  Material Transactions.  (a) Settle any material 
litigation or (b) enter into any material transaction or make any 
material commitment relating to its assets and business, 

                                  19
<PAGE>


otherwise than as contemplated hereby or in the ordinary course 
of business consistent with past practice;

     (7)  Actions Not in Ordinary Course.  Take any other action 
not in the ordinary course of business consistent with past 
practice; or 

     (8)  Agreements.  Agree to take any of the foregoing actions 
(except to the extent Tysons' Board of Directors is required to 
authorize any such agreement on behalf of Tysons in order to 
comply with the directors' fiduciary duties as advised in writing 
by counsel).


                	IV.  REPRESENTATIONS AND WARRANTIES

     Tysons hereby represents and warrants to MSBC and, upon 
Holding Company's execution of this Agreement, to Holding 
Company, and MSBC hereby represent and warrant to Tysons and 
Holding Company upon its execution of this Agreement hereby 
represents and warrants as applicable to MSBC, as follows:

     (A)  Recitals.  The facts set forth in the Recitals of this 
Plan with respect to it and its respective Subsidiaries are true 
and correct;

     (B)  Capitalization.  The outstanding shares of it and its 
respective Subsidiaries are validly issued and outstanding, fully 
paid and nonassessable, and subject to no preemptive rights;

     (C)  General Corporate Power and Ownership of Properties.  
It and its respective Subsidiaries have the corporate power and 
authority to carry on their respective business as now being 

                                  20
<PAGE>


conducted and to own all of their respective material properties 
and assets and have good and marketable title to or a valid 
leasehold interest in all of the material properties and assets 
thereof reflected as owned or leased in its balance sheet as of 
December 31, 1996, and included in the Financial Reports (as 
hereinafter defined) and in all material properties and assets 
acquired or leased by it or its respective Subsidiaries, since 
December 31, 1996.  In the case of Tysons and its Subsidiary 
only, none of such properties is subject to any mortgage, pledge, 
lien, security interest, encumbrance, restriction or charge of 
any kind except:  (1) mechanic's, carrier's, worker's or similar 
liens arising in the ordinary course of business; (2) as 
Previously Disclosed; (3) imperfections of title, if any, none of 
which is material in amount or materially detracts from the value 
or impairs the existing use of the property subject thereto or 
the operations of Tysons or its Subsidiary; and (4) liens of 
current taxes not due and payable;

     (D)  Specific Corporate Authority.  Subject to any necessary 
receipt of approval by its stockholders and the regulatory 
approvals referred to in Paragraphs (B) and (C) of Article VI, 
this Plan has been authorized by all necessary corporate action 
of it and is a valid and binding agreement of it enforceable 
against it in accordance with its terms, subject to (1) 
bankruptcy, insolvency and other laws of general applicability 
relating to or affecting creditors' rights; and (2) general 

                                  21
<PAGE>


equity principles and, in the case of Tysons, it represents and 
warrants to MSBC that the Stock Option Agreement has been 
authorized by all necessary corporate action of it and is a valid 
and binding agreement of it enforceable against it in accordance 
with its terms subject only to conditions (1) and (2) in the 
immediately preceding sentence. 

     (E)  No Default.  The execution, delivery and performance of 
this Plan and, in the case of Tysons, the Stock Option Agreement 
and the consummation of the transactions contemplated hereby and 
thereby by it, will not constitute:  (1) a breach of violation 
of, or a default under, any law, rule or regulation or any 
judgment, decree, order, governmental permit or license, 
franchise or agreement, indenture, instrument or authorization 
applicable to, of or held by it or its Subsidiaries, or to which 
it, its Subsidiaries or its or its Subsidiaries' respective 
properties are subject or bound, which breach, violation or 
default is reasonably likely to have a Material Adverse Effect on 
it; or (2) a breach or violation of, or a default under, its or 
its Subsidiaries' respective Articles of Incorporation or Bylaws; 

     (F)  Financial Reports.  Except as Previously Disclosed, (1) 
its Annual Report on Form 10-K, for the fiscal year ended 
December 31, 1996, and all other documents filed or to be filed 
subsequent to December 31, 1996 under Sections 13(a), 13(c), 14 
or 15(d) of the Exchange Act in the form filed with the SEC, all 
of which have been Previously Disclosed (all of the foregoing 

                                  22
<PAGE>


reports and documents of MSBC and Tysons, respectively, are 
hereinafter referred to as its "Financial Reports") did not and 
will not contain any untrue statement of a material fact or omit 
to state a material fact required to be stated therein or 
necessary to make the statements made therein, in light of the 
circumstances under which they were made, not misleading; and 
each of the balance sheets in or incorporated by reference into 
the Financial Reports (including the related notes and schedules 
thereto) fairly presents and will fairly present the financial 
position of the entity or entities to which it relates as of its 
date and each of the statements of income and changes in 
stockholders' equity and cash flows or equivalent statements in 
the Financial Reports (including any related notes and schedules 
thereto) fairly presents and will fairly present the results of 
operations, changes in stockholders' equity and changes in cash 
flows, as the case may be, of the entity or entities to which it 
relates for the periods set forth therein, in each case in 
accordance with generally accepted accounting principles 
consistently applied, except as may be noted therein, subject to 
normal and recurring year-end audit adjustments in the case of 
unaudited statements;

     (G)  Regulatory Reports.  In the case of Tysons only, it has 
Previously Disclosed to MSBC copies of (1) TNB's "Annual Report 
of Condition and Income" on Form FFIEC 033, as delivered to the 
appropriate bank regulatory authority for the years ended 

                                  23
<PAGE>


December 31, 1994, December 31, 1995, and December 31, 1996 and 
for the period ending March 31, 1997; and (2) all other material 
reports and documents filed with or sent to any federal or state 
regulatory authority by it or TNB during 1995, 1996 and 1997; and 
(3) to the extent not prohibited by law, all reports of any state 
or federal regulatory authority relating to it or TNB and 
received during or relating to matters in 1995, 1996 or 1997 (all 
of the foregoing reports and documents are hereinafter referred 
to as "Regulatory Reports").  Tysons represents and warrants to 
MSBC that, as of their respective dates the Regulatory Reports 
referred to in (1) and (2) above complied in all material 
respects with all legal and regulatory requirements applicable 
thereto and the Regulatory Reports referred to in (1) above are 
accurate in all material respects and fairly present the 
financial condition and income of the reporting entity for the 
period(s) covered thereby.

     (H)  Material Events.  Except as Previously Disclosed, since 
December 31, 1996, no event has occurred which is reasonably 
likely to have a Material Adverse Effect on it;

     (I)  Litigation.  Except as Previously Disclosed, no 
litigation, proceeding or controversy before any court or 
governmental agency is pending which is reasonably likely to have 
a Material Adverse Effect on it and, to the best of its 
knowledge, no such litigation, proceeding or controversy has been 
threatened; 

                                  24
<PAGE>


     (J)  Material Contracts.  Except as Previously Disclosed or 
as previously disclosed in the Financial Reports and except for 
this Plan and the Stock Option Agreement, neither it nor any 
Subsidiary is bound by any material contract (as to it and its 
Subsidiaries taken as a whole) to be performed after the date 
hereof;

     (K)  Commissions.  All negotiations relative to this Plan 
and the transactions contemplated hereby have been carried on by 
it directly with the other parties hereto and no action has been 
taken by it that would give rise to any valid claim against any 
party hereto for a brokerage commission, finder's fee or other 
like payment, excluding a fee in an amount Previously Disclosed 
to be paid to Scott & Stringfellow, who have acted as financial 
advisors to Tysons;

     (L)  ERISA.  Except as Previously Disclosed:

          (1)  all "employee benefit plans" within the meaning of 
Section 3(3) of the Employee Retirement Income Security Act of 
1974, as amended ("ERISA"), covering employees or former 
employees of it and/or its Subsidiaries (the "Employees") are 
Previously Disclosed, true and complete copies of which have been 
made available to the other party;

          (2)  all employee benefit plans covering Employees, to 
the extent subject to ERISA (the "ERISA Plans"), are in 
compliance with ERISA, except for failure to so comply which are 
not reasonably likely, individually or in the aggregate, to have 

                                  25
<PAGE>


a Material Adverse Effect on it; each ERISA Plan which is an 
"employee pension benefit plan" within the meaning of Section 
3(2) of ERISA ("Pension Plan") and which is intended to be 
qualified under Section 401(a) of the Internal Revenue Code of 
1986, as amended (the "Code"), has either (a) received a 
favorable determination letter from the Internal Revenue Service, 
or (b) is or will be the subject of an application for a 
favorable determination letter, and it is not aware of any 
circumstances likely to result in the revocation or denial of any 
such favorable determination letter; there is no pending or, to 
the best of its knowledge, threatened litigation relating to the 
ERISA Plans which is reasonably likely, individually or in the 
aggregate, to have a Material Adverse Effect on it; and neither 
it nor any Subsidiary has engaged in a transaction with respect 
to any ERISA Plan that, assuming the taxable period of such 
transaction expired as of the date hereof, would subject it or 
the Subsidiary to a tax or penalty imposed by either Section 4975 
of the Code or Section 502(i) of ERISA in an amount which is 
reasonably likely, individually or in the aggregate, to have a 
Material Adverse Effect on it;

          (3)  no liability under Subtitle C or D of Title IV of 
ERISA has been or is expected to be incurred by it or any 
Subsidiary with respect to any ongoing, frozen or terminated 
"single-employer plan", within the meaning of Section 4001(a)(15) 
of ERISA, currently or formerly maintained by any of them or any 

                                  26
<PAGE>


entity which is considered one "employer" with it or any 
Subsidiary under Section 4001(a)(14) of ERISA or Section 414 of 
the Code (an "ERISA Affiliate"), which liability is reasonably 
likely to have a Material Adverse Effect on it; neither it nor 
any Subsidiary has incurred and does not expect to incur any 
withdrawal liability with respect to a multiemployer plan under 
Subtitle E of Title IV of ERISA; and to its knowledge no notice 
of a "reportable event" within the meaning of Section 4043 of 
ERISA for which the 30-day reporting requirement has not been 
waived, has been required to be filed for any Pension Plan or the 
Pension Plan of an ERISA Affiliate within the 12-month period 
ending on the date hereof;

          (4)  during the current plan year and the immediately 
preceding three plan years of such ERISA Plan, all contributions 
required to be made under the terms of any ERISA Plan of it or an 
ERISA Affiliate have been timely made; and no pension plan of it 
or an ERISA Affiliate has an "accumulated funding deficiency" 
(whether or not waived) within the meaning of Section 412 of the 
Code or Section 302 of ERISA which is reasonably likely, 
individually or in the aggregate, to have a Material Adverse 
Effect on it;

          (5)  under each Pension Plan which is a single-employer 
plan, as of the last day of the most recent plan year ended prior 
to the date hereof, the actuarially determined present value of 
all "benefit liabilities", within the meaning of Section 

                                  27
<PAGE>


4001(a)(16) of ERISA (as determined on the basis of the actuarial 
assumptions contained in the ERISA Plan's most recent actuarial 
valuation) did not exceed the then current value of the assets of 
such ERISA Plan, and there has been no material adverse change in 
the financial position of such ERISA Plan since the last day of 
the most recent plan year; and 

          (6)  there are no material current or projected 
liabilities for retiree health or life insurance benefits; 

     (M)  Regulatory Approvals.  It knows of no reason why the 
regulatory approvals referred to in Paragraphs (B) and (C) of 
Article VI should not be obtained without the imposition of any 
condition of the type referred to in the proviso following such 
Paragraph (C).

     (N)  Agreements with Bank Regulators.  Except as Previously 
Disclosed neither MSBC or Tysons, respectively, are a party to 
any written agreement or memorandum of understanding with, or a 
party to any commitment letter or similar undertaking to, or is 
subject to any order or directive by, or a recipient of any 
extraordinary supervisory letter from, any bank regulator which 
restricts materially the conduct of its business, or in any 
manner relates to its capital adequacy, its credit or reserve 
policies or its management, nor has either party been advised by 
any bank regulator that it is contemplating issuing or requesting 
any such order, decree, agreement, memorandum of understanding, 

                                  28
<PAGE>


extraordinary supervisory letter, commitment letter or similar 
submission.

     (O)  Subsidiaries.  In the case of Tysons only, it has no 
subsidiaries other than TNB, all of the outstanding shares of 
which are validly issued, fully paid and nonassessable (except 
pursuant to 12 USC Section 55) and are owned by it free and clear 
of all liens, claims, encumbrances and restrictions on transfer 
whatsoever.  In the case of MSBC only, its only Subsidiaries are 
the MSBC Subsidiaries, all of the outstanding shares of which 
(with the exception of the Holding Company as of the date hereof) 
are validly issued, fully paid and nonassessable (except pursuant 
to 12 USC Section 55 or comparable state law) and are owned by it 
free and clear of all liens, claims, encumbrances and restrictions 
on transfer whatsoever.

     (P)  Collective Bargaining Contracts.  Neither it nor any 
Subsidiary is a party to or is bound by any collective bargaining 
agreement, contract or other agreement or understanding with a 
labor union or labor organization or is the subject of a 
proceeding asserting that it or the Subsidiary has committed an 
unfair labor practice (within the meaning of the National Labor 
Relations Act) or seeking to compel it or the Subsidiary to 
bargain with any labor organization as to wages and conditions of 
employment.  There is not any strike or other labor dispute 
involving it or any Subsidiary and to the best of its knowledge 
none is threatened.  It is not aware of any activity involving 

                                  29
<PAGE>


the employees of it or any Subsidiary seeking to certify a 
collective bargaining unit or engaging in any other organization 
activity;

     (Q)  Classified Assets.  Tysons has Previously Disclosed a 
list of the loans, extensions of credit or other assets of TNB 
that were classified by the examiners of the Office of the 
Comptroller of the Currency ("OCC") in its last respective 
preceding examination ("TNB Asset Classification") and has 
Previously Disclosed a list of its loans and extensions of credit 
by TNB in the respective initial principal amount of $50,000 or 
more, any payment of which is, as of the date so disclosed, 
delinquent ("TNB Delinquent Loan List"). The TNB Asset 
Classification and the TNB Delinquent Loan List are, 
respectively, accurate and complete in all material respects and 
no amounts of loans, extensions of credit or other assets that 
have been classified as of the respective date of the TNB Asset 
Classification by any regulatory examiner as "Other Loans 
Specially Mentioned", "Substandard", "Doubtful", "Loss", or words 
of similar import are excluded from the amounts disclosed in the 
TNB Asset Classification as of the respective date thereof other 
than amounts of loans, extensions of credit or other assets that 
were charged off by TNB prior to the respective date of the TNB 
Asset Classification;

     (R)  Affiliates.  In the case of Tysons only, except as 
Previously Disclosed, to the best of its knowledge, there is no 

                                  30
<PAGE>


person who, as of the date of this Plan, may be deemed to be an 
"affiliate" of it as that term is used in Rule 145 under the 
Securities Act of 1933, as amended (together with the rules and 
regulations thereunder, the "Securities Act"; hereinafter the 
Securities Act and the Exchange Act are referred to as the 
"Federal Securities Laws");

     (S)  Insurance Policies.  In the case of Tysons only, it has 
made available to MSBC correct and complete copies of all of its 
or its Subsidiary's insurance policies respecting the properties, 
operations, liabilities, officers, directors and employees 
thereof, all of which are in full force and effect or provide 
coverage to it or its Subsidiary and their respective officers, 
directors and employees.

     (T)  MSBC Stock.  In the case of MSBC only, the shares of 
MSBC Common Stock to be issued in exchange for shares of Tysons 
Common Stock and for the Directors Options upon consummation of 
the Merger and upon exercise of the ISO's after the Merger 
Effective Date will have been duly authorized and, when issued in 
accordance with the terms of this Plan, will be validly issued, 
fully paid and nonassessable and subject to no preemptive rights;

     (U)  Takeover Laws.  In the case of Tysons only, it has 
taken all necessary action to exempt the transactions 
contemplated by this Plan and the Stock Option Agreement from, or 
the transactions contemplated by this Plan and the Stock Option 
Agreement are otherwise exempt from, any applicable state 

                                  31
<PAGE>


takeover laws in effect as of the date of this Plan, including, 
without limitation, Articles 14 and 14.1 of the Virginia Stock 
Corporation Act.

     (V)  Approval of This Transaction.  In the case of Tysons 
only, it has taken all action so that the entering into of this 
Plan and the Stock Option Agreement and the consummation of the 
transactions contemplated hereby and thereby (including without 
limitation the Merger) or any other action or combination of 
actions, or any other transactions, contemplated hereby or 
thereby do not and will not (1) require a vote of stockholders 
(other than as set forth in Paragraph (A) of Article VI); or (2) 
result in the grant of any rights to any person under its 
Articles of Incorporation or Bylaws or, except as Previously 
Disclosed, under any agreement; or (3) except as set forth in 
Paragraphs (B) and (C) of Article VI, and Section 8 of the Stock 
Option Agreement and except for consents required to be obtained 
from the holders of Tysons Warrants and Tysons Options, require 
any consent or approval under any law, rule, regulation, 
judgment, decree, order, governmental permit or license or, 
except as Previously Disclosed, the consent or approval of any 
other party to any agreement, indenture or instrument; or (4) 
restrict or impair in any way the ability of MSBC to exercise the 
rights granted hereunder or under the Stock Option Agreement.

     (W)  Environmental Laws.  As to Tysons only, 

          (1)  To its knowledge, it, its Subsidiary, the 
Participation Facilities and the Loan Properties (each as 

                                  32
<PAGE>


defined below) are, and have been, in compliance with all 
Environmental Laws (as defined below), except for instances of 
noncompliance which are not reasonably likely, individually or 
in the aggregate, to have a Material Adverse Effect on it;

          (2)  there is no proceeding pending or, to its 
knowledge, threatened before any court, governmental agency or 
board or other forum in which it, its Subsidiary, or any 
Participation Facility has been, or with respect to threatened 
proceedings, reasonably would be expected to be, named as a 
defendant or potentially responsible party (a) for alleged 
noncompliance (including by any predecessor) with any 
Environmental Law or (b) relating to the release or threatened 
release into the environment of any Hazardous Material (as 
defined below), whether or not occurring at or on a site owned, 
leased or operated by it, its Subsidiary or any Participation 
Facility, except for such proceedings pending or threatened that 
are not reasonably likely, individually or in the aggregate, to 
have a Material Adverse Effect on it;

          (3)  to its knowledge, there is no proceeding pending 
or threatened before any court, governmental agency or board or 
other forum in which any Loan Property, it or its Subsidiary is 
or with respect to threatened proceedings, reasonably would be 
expected to be, named as a defendant or potentially responsible 
party (a) for alleged noncompliance (including by any 

                                  33
<PAGE>


predecessor) with any Environmental Law or (b) relating to the 
release or threatened release into the environment of any 
Hazardous Material, except for such proceedings pending or 
threatened that are not reasonably likely, individually or in the 
aggregate, to have a Material Adverse Effect on it;

          (4)  to its knowledge, there is no reasonable basis for 
any proceeding of a type described in subparagraphs (2) or (3) 
above;

          (5)  to its knowledge, during the period of its or its 
Subsidiary's (a) ownership or operation of any of their 
respective current properties, (b) participation in the 
management of any Participation Facility, or (c) holding of a 
security interest in a Loan Property, there have been no releases 
of Hazardous Material in, on, under or affecting any such 
property, Participation Facility or Loan Property, except for 
such releases that are not reasonably likely, individually or in 
the aggregate, to have a Material Adverse Effect on it;

          (6)  to its knowledge, prior to the period of its or 
its Subsidiary's: (a) ownership or operation of any of their 
respective current properties, (b) participation in the 
management of any Participation Facility, or (c) holding of a 
security interest in a Loan Property, there were no releases of 
Hazardous Material in, on, under or affecting any such property, 
Participation Facility or Loan Property, except for such releases 

                                  34
<PAGE>


that are not reasonably likely, individually or in the aggregate, 
to have a Material Adverse Effect on it;

          (7)  the following definitions apply for purposes of 
this Paragraph (V):  "to its knowledge" means the actual 
knowledge of any officer of Tysons, any information contained in 
the business records of Tysons and, with respect to any "Loan 
Property", any information contained in a Phase I or Phase II 
environmental assessment furnished to Tysons; "Loan Property" 
means any property owned by it or its Subsidiary or in which it 
or its Subsidiary holds a security interest, and, where required 
by the context, includes the owner or operator of such property, 
but only with respect to such property; "Participation Facility" 
means any facility in which it or its Subsidiary participates in 
the management and, where required by the context, includes the 
owner or operator or such property, but only with respect to such 
property; "Environmental Law" means (a) any federal, state and 
local law, statute, ordinance, rule, regulation, code, license, 
permit, authorization, approval, consent, legal doctrine, order, 
judgment, decree, injunction, requirement or agreement with any 
governmental entity, relating to (i) the protection, preservation 
or restoration of the environment (including, without limitation, 
air, water vapor, surface water, groundwater, drinking water 
supply, surface land, subsurface land, plant and animal life or 
any other natural resource), or to human health or safety, or 
(ii) the exposure to, or the use, storage, recycling, treatment, 

                                  35
<PAGE>


generation, transportation, processing, handling, labeling, 
production, release or disposal of Hazardous Material, in each 
case as amended and as now in effect and includes, without 
limitation, the federal Comprehensive Environmental Response, 
Compensation, and Liability Act of 1980, the Superfund Amendments 
and Reauthorization Act, the Federal Water Pollution Control Act 
of 1972, the federal Clean Air Act, the Federal Clean Water Act, 
the Federal Resource Conservation and Recovery Act of 1976 
(including the Hazardous and Solid Waste Amendments thereto), the 
Federal Solid Waste Disposal Act and the Federal Toxic Substances 
Control Act, and the Federal Insecticide, Fungicide and 
Rodenticide Act, the Federal Occupational Safety and Health Act 
of 1970, each as amended and as now in effect, and (b) any common 
law or equitable doctrine (including, without limitation, 
injunctive relief and tort doctrines such as negligence, 
nuisance, trespass and strict liability) that may impose 
liability or obligations for injuries or damages due to, or 
threatened as a result of, the presence of or exposure to any 
Hazardous Material; "Hazardous Material" means any substance 
presently listed, defined, designated or classified as hazardous, 
toxic, radioactive or dangerous, or otherwise regulated, under 
any Environmental Law, whether by type or quantity, and includes, 
without limitation, any oil or other petroleum product, toxic 
waste, pollutant, contaminant, hazardous substance, toxic 
substance, hazardous waste, special waste or petroleum or any 

                                  36
<PAGE>


derivative or by-product thereof, radon, radioactive material, 
asbestos, asbestos containing material, urea formaldehyde foam 
insulation, lead and polychlorinated biphenyl;

     (X)  Taxes.  Except as Previously Disclosed, to the best of 
its knowledge (1) all reports and returns with respect to Taxes 
(as defined below) that are required to be filed by or with 
respect to it or its Subsidiaries, including without limitation 
consolidated federal income tax returns of it and its 
Subsidiaries (collectively, the "Tax Returns"), have been duly 
filed, or requests for extensions have been timely filed and have 
not expired, for periods ended on or prior to June 30, 1997, and 
on or prior to the date of the most recent fiscal year end 
immediately preceding the Merger Effective Date, except to the 
extent all such failures to file, taken together, are not 
reasonably likely to have a Material Adverse Effect on it, and 
such Tax Returns were true, complete and accurate in all material 
respects, (2) all material taxes (which shall mean federal, 
state, local or foreign income, gross receipts, windfall profits, 
severance, property, production, sales, use, license, excise, 
franchise, employment, withholding or similar taxes imposed on 
the income, properties or operations of it and its Subsidiaries, 
together with any interest, additions, or penalties with respect 
thereto and any interest in respect of such additions or 
penalties, collectively the "Taxes") shown to be due on the Tax 
Returns have been paid in full, (3) all Taxes due with respect to 

                                  37
<PAGE>


completed and settled examinations have been paid in full, (4) no 
issues have been raised by the relevant taxing authority in 
connection with the examination of any of the Tax Returns which 
are reasonably likely to result in a determination that would 
have a Material Adverse Effect on it, except as reserved against 
in its Financial Reports, and (5) no waivers of statutes of 
limitations (excluding such statutes that relate to years 
currently under examination by the Internal Revenue Service) have 
been given by or requested with respect to any Taxes of it or its 
Subsidiaries;

     (Y)  Legal Compliance.  Except as Previously Disclosed, it 
and its Subsidiaries are in substantial compliance with all 
applicable laws relating to their respective business or 
employment practices or the ownership of their respective 
properties and are in substantial compliance with each applicable 
law, ordinance, order, decree or resolution of any governmental 
entity applicable to the conduct thereof or the ownership of the 
properties thereto in each case which either alone or in the 
aggregate have or would have a Material Adverse Effect on it.  

     (Z)  Certain Interests.  Except in arm's length transactions 
pursuant to normal commercial terms and conditions, no executive 
officer or director of it or its Subsidiaries has any material 
interest in any property, real or personal, tangible or 
intangible, used in or pertaining to the business of it and its 
Subsidiaries, except for the usual rights of a shareholder in it; 

                                  38
<PAGE>


no such person is indebted to it, except for normal business 
expense advances and for loans made, in the case of MSBC, by an 
MSBC Bank Subsidiary, and in the case of Tysons, by TNB, in each 
case in full compliance with the law, including but not limited 
to, Regulation O of the Board of Governors of the Federal Reserve 
System ("FRB") and in the ordinary course of business; and it is 
not indebted to such person except for amounts due under normal 
and disclosed compensation arrangements or reimbursement of 
ordinary business expenses.

     (AA)  Licenses.  It and its Subsidiaries have in effect all 
approvals, authorizations, consents, licenses, clearances, and 
orders of and registrations with all governmental and regulatory 
authorities the failure to have and comply with which either 
alone or in the aggregate would have a Material Adverse Effect on 
it.

     (BB)  Liabilities.  Except to the extent reflected or 
reserved against in its Financial Reports and except as 
Previously Disclosed or incurred in the ordinary course of 
business since the date of its most recent Financial Report, it 
and its Subsidiaries have no material liability or obligation of 
any nature whether accrued, absolute, contingent or otherwise and 
whether due or to become due; 

     (CC)  Ten Percent Shareholders.  It has no shareholder who 
owns of record or beneficially 10% or more of the outstanding 
shares of Tysons Common Stock, or MSBC Common Stock, as the case 

                                  39
<PAGE>


may be, and there is no person known to it who, directly or 
indirectly, through any contract, arrangement, understanding, 
relationship or otherwise has or shares (1) voting power which 
includes the power to vote or to direct the voting of, such 
shares and/or (2) investment power, which includes the power to 
dispose or to direct the disposition, of 10% or more of the 
outstanding shares of Tysons Common Stock or MSBC Common Stock, 
as the case may be (all of the foregoing, "10% Ownership").  
There is no person to its knowledge who, directly or indirectly, 
has created or uses a trust, proxy, power of attorney, pooling 
arrangement or any other contract, arrangement or device with the 
purpose or effect of divesting such person of 10% Ownership or 
preventing the vesting of 10% Ownership.  A person shall also be 
deemed to be a beneficial owner for purposes of the foregoing if 
that person has the right to acquire beneficial of such shares 
within 60 days;

     (DD)  Option Shares.  In the case of Tysons only, the Option 
Shares (as defined in the Stock Option Agreement) when issued 
upon exercise of the Option, will be validly issued, fully paid 
and nonassessable and subject to no preemptive rights.

     (EE)  Articles and Bylaws.  In the case of Tysons only, 
true, correct and current copies of its and its Subsidiary's 
Articles of Incorporation (or Association) and bylaws have been 
delivered to MSBC.

                                  40
<PAGE>


     (FF)  Dissenters Rights.  In the case of Tysons only, the 
holders of shares of Tysons Common Stock have no dissenters 
rights of appraisal in accordance with Article 15 of the Virginia 
Stock Corporation Act.  

     (GG)  MSBC Shareholder Approval.  In the case of MSBC, the 
approval of the Merger by the holders of shares of MSBC Common 
Stock is not required.


	                           V.  COVENANTS

     Tysons hereby covenants to MSBC, and MSBC hereby covenants 
to Tysons, that:

     (A)  Best Efforts to Complete Merger.  Subject to the terms 
and conditions of this Plan, it shall use its best efforts in 
good faith to take, or cause to be taken, all actions, and to do, 
or cause to be done, all things necessary, proper or desirable, 
or advisable under applicable laws, as promptly as practicable so 
as to permit consummation of the Merger within the time 
contemplated by this Agreement and to otherwise enable 
consummation of the transactions contemplated hereby and by the 
Stock Option Agreement and shall cooperate fully with the other 
parties hereto to that end (it being understood that any 
amendments to the Registration Statement (as hereinafter defined) 
or a resolicitation of proxies as a consequence of an acquisition 
agreement by MSBC shall not violate this covenant), including (1) 
using its best efforts to lift or rescind any order adversely 
affecting its ability to consummate the transactions contemplated 

                                  41
<PAGE>


herein and in the Stock Option Agreement and to cause to be 
satisfied the conditions referred to in Article VI and in the 
Stock Option Agreement, and each of Tysons and MSBC shall use, 
and shall cause their respective Subsidiaries to use, their 
respective best efforts to obtain all consents (governmental or 
other) necessary or desirable for the consummation of the 
transactions contemplated by this Plan and the Stock Option 
Agreement; and (2) in the case of Tysons, cooperating with MSBC 
in supplying such information as MSBC may reasonably request in 
connection with any public offerings of securities by MSBC prior 
to the Merger Effective Date; 

     (B)  Tysons Proxy Statement.  In the case of Tysons only,  
(1) it shall promptly prepare and provide to MSBC prior to its 
filing and mailing a proxy statement (the "Proxy Statement") to 
be mailed to the holders of Tysons Common Stock in connection 
with the Merger and to be filed by MSBC in a registration 
statement (the "Registration Statement") with the SEC, which 
shall conform to all applicable legal requirements; (2) without 
limiting the foregoing, at the time such Proxy Statement or any 
amendment or supplement thereto is mailed to holders of Tysons 
Common Stock and at all times thereafter up to and including the 
meeting of Tysons shareholders referred to in Subparagraph (3) of 
this Paragraph (B), the Proxy Statement and such amendments and 
supplements will comply in all material respects with the 
provisions (to the extent applicable) of the Exchange Act and 

                                  42
<PAGE>


will not contain any untrue statement of a material fact or omit 
to state a material fact required to be stated therein or 
necessary to make the statements contained therein not 
misleading; provided, however, in no event shall any party hereto 
be liable for any untrue statement of a material fact or omission 
to state a material fact in the Proxy Statement made in reliance 
upon, and in conformity with, written information concerning 
another party furnished by such other party specifically for use 
in the Proxy Statement; (3) it shall hold a special meeting (the 
"Meeting") of the holders of Tysons Common Stock as soon as 
practicable after the Registration Statement has become effective 
for purposes of voting upon this Plan, the Plan of Merger and the 
Merger contemplated hereby and thereby, and (4) subject to the 
fiduciary duties of the Board of Directors of Tysons (as advised 
in writing by its counsel), it shall use its best efforts to 
solicit and obtain votes of the holders of Tysons Common Stock in 
favor of the above proposals and shall once, at MSBC's request, 
recess or adjourn the Meeting for a period not exceeding ten days 
(unless Tysons consents to a longer period) if such recess or 
adjournment is deemed by MSBC to be necessary or desirable;

     (C)  Registration Statement Contents.  When the Registration 
Statement or any post-effective amendment or supplement thereto 
shall become effective, and at all times subsequent to such 
effectiveness, up to and including the date of the Meeting, such 
Registration Statement and all amendments or supplements thereto, 

                                  43
<PAGE>


with respect to all information set forth therein furnished or to 
be furnished by Tysons relating to Tysons and its Subsidiary and 
by MSBC relating to MSBC  and the MSBC Subsidiaries (1) will 
comply in all material respects with the provisions of the 
Securities Act and any other applicable statutory or regulatory 
requirements, and (2) will not contain any untrue statement of a 
material fact or omit to state a material fact required to be 
stated therein or necessary to make the statements contained 
therein not misleading; provided, however, in no event shall any 
party hereto be liable for any untrue statement of a material 
fact or omission to state a material fact in the Registration 
Statement made in reliance upon, and in conformity with, written 
information concerning another party furnished by such other 
party specifically for use in the Registration Statement.  In 
connection with the preparation of the Registration Statement and 
related Prospectus/Proxy Statement, each will cooperate with the 
other and will furnish the information concerning itself required 
by law to be included therein;

     (D)  Effectiveness of Registration Statement.  MSBC will 
advise Tysons, promptly after MSBC receives notice thereof, of 
the time when the Registration Statement has become effective or 
any supplement or amendment has been filed or of the issuance of 
any stop order or the suspension of the qualification of the MSBC 
Common Stock for offering or sale in any jurisdiction, of the 
initiation or threat of any proceeding for any such purpose, or 

                                  44
<PAGE>


of any request by the SEC for the amendment or supplement of the 
Registration Statement or for additional information;

     (E)  Public Announcements.  It agrees that, unless approved 
by the other party hereto in advance, it will not issue any press 
release or written statement for general circulation relating to 
the transactions contemplated hereby, except as otherwise 
required by law or applicable NASD or stock exchange rule; 

     (F)  Review of Information.  (1) Upon reasonable notice, it 
shall afford the other party hereto, and its officers, employees, 
counsel, accountants and other authorized representatives, 
access, during normal business hours throughout the period prior 
to the Merger Effective Date, to all of its properties, books 
contracts, commitments and records to the extent permitted by law 
and, during such period, it shall furnish promptly to the other 
party hereto (a) a copy of each material report, schedule and 
other document filed by it pursuant to the requirements of the 
Federal Securities Laws or any state laws, rules and regulations 
regulating the issuance, sale or exchange of securities or the 
markets in which any of the foregoing occurs ("Blue Sky Law(s)" 
which together with the Federal Securities Laws are hereinafter 
referred to as the "Securities Laws") or banking laws, and (b) 
all other information concerning its business, properties and 
personnel as the other parties hereto may reasonably request, 
provided that no investigation pursuant to this Paragraph (F) by 
any party shall affect or be deemed to modify or waive any 

                                  45
<PAGE>


representation or warranty made by any other party hereto or the 
conditions to the obligation of the first party to consummate the 
transactions contemplated by the Plan; and (2) each party hereto 
will not use any information obtained pursuant to this Paragraph 
(F) for any purpose unrelated to the consummation of the 
transactions contemplated by this Plan and the Stock Option 
Agreement and, if the Merger is not consummated, will hold all 
information and documents obtained pursuant to this paragraph in 
confidence (as provided in Paragraph (F) of Article VIII) unless 
and until such time as such information or documents become 
publicly available other than by reason of any action or failure 
to act by such party or as it is advised by counsel that any such 
information or document is required by law or applicable NASD or 
stock exchange rule to be disclosed, and in the event of the 
termination of this Plan, each party will, upon request by the 
other party, deliver to the other all documents so obtained by it 
or destroy such documents;

     (G)  No Solicitation.  In the case of Tysons only, (1) it 
shall not, and shall direct the officers, directors, employees 
and other persons affiliated with it or any investment banker, 
attorney, accountant or other representative of it, not to, 
directly or indirectly, solicit or encourage inquiries or 
proposals with respect to, or (except as required by the 
fiduciary duties of its Board of Directors as advised in writing 
by its counsel) furnish any nonpublic information relating to or 

                                  46
<PAGE>


participate in any negotiations or discussion concerning, any 
acquisition or purchase of all or a substantial portion of the 
assets of, or a substantial equity interest in, it or any merger 
or other business combination with it other than as contemplated 
by this Plan; (2) shall notify MSBC immediately if any such 
inquiries or proposals are received by, or any such negotiations 
or discussions are sought to be initiated with, it; and (3) shall 
instruct its officers, directors, agents, advisors and affiliates 
to refrain from doing any of the foregoing;  

     (H)  Filing of Registration Statement.  In the case of MSBC 
only, it shall, as promptly as practicable following the date of 
this Plan, prepare and file the Registration Statement with the 
SEC and MSBC shall use its best efforts to cause the Registration 
Statement to be declared effective as soon as practicable after 
the filing thereof;

     (I)  Blue Sky.  In the case of MSBC only, it shall use its 
best efforts to obtain, prior to the effective date of the 
Registration Statement, all necessary Blue Sky Law permits and 
approvals, provided that MSBC shall not be required by virtue 
thereof to submit to general jurisdiction in any state;

     (J)  Affiliates.  In the case of Tysons only, it will cause 
each person who may be deemed to be an "affiliate" of it for 
purposes of Rule 145 under the Securities Act to execute and 
deliver to in the form attached hereto as Exhibit B restricting 
the disposition of such affiliate's shares of Tysons Common Stock 

                                  47
<PAGE>


and the shares of MSBC Common Stock to be received by such person 
in exchange for such person's shares of Tysons' Common Stock;

     (K)  Tysons' Policies and Practices.  In the case of Tysons 
only:  Tysons shall and shall cause its Subsidiary to use its 
best efforts to modify and change its credit, investment, 
litigation, and real estate valuation policies and practices 
(including loan classifications and levels of reserves) prior to 
the Merger Closing so as to be consistent on a mutually 
satisfactory basis with those of MSBC and generally accepted 
accounting principles.  Tysons shall not be required to modify or 
change any policies or practices, however, until (x) satisfaction 
of the conditions set forth in Paragraphs (A), (B) and (C) of 
Article VI, (y) such time as Tysons and MSBC shall reasonably 
agree that the Merger Closing will occur prior to public 
disclosure of such modifications or changes in regular periodic 
earnings releases or periodic reports filed with the SEC or other 
applicable governmental authority available to the public, and 
(z) such time as MSBC acknowledges in writing that all conditions 
to MSBC's obligation to consummate the Merger (and MSBC's rights 
to terminate this Plan) have been waived or satisfied; provided, 
however, that in all circumstances Tysons shall and shall cause 
its Subsidiary to make such modifications and changes not later 
than immediately prior to the Merger Effective Date.  Tysons' 
representations, warranties and covenants and contained in the 
Plan shall not be deemed to be untrue or breached in any respect 

                                  48
<PAGE>


for any purpose as a consequence of any modifications or changes 
undertaken solely on account of this Paragraph (K);

     (L)  State Takeover Laws.  In the case of Tysons only, it 
shall not take any action that would cause the transactions 
contemplated by this Plan and/or the Stock Option Agreement to be 
subject to any applicable state takeover statute in effect as of 
the date of this Plan and shall take all necessary steps to 
exempt (or ensure the continued exemption of) the transactions 
contemplated by this Plan and the Stock Option Agreement from, or 
if necessary challenge the validity or applicability of, any 
applicable state takeover law, as now or hereafter in effect, 
including, without limitation, Articles 14 and 14.1 of the 
Virginia Stock Corporation Act;

     (M)  Tysons Special Shareholder Rights.  In the case of 
Tysons only:  (1) it shall take all necessary steps to ensure 
that the entering into of this Plan and the Stock Option 
Agreement and the consummation of the transactions contemplated 
hereby and thereby (including without limitation the Merger and 
the exercise of the Option) and any other action or combination 
of actions, or any other transactions contemplated hereby or 
thereby do not and will not result in the grant of any rights to 
any person under the Articles of Incorporation of Bylaws of 
Tysons or under any agreement to which Tysons is a party (other 
than as Previously Disclosed); or (2) it shall not restrict or 

                                  49
<PAGE>


impair in any way the ability of MSBC to exercise the rights 
granted hereunder or under the Stock Option Agreement;

     (N)  Shareholder Approval.  In the case of Tysons, only, it 
shall not adopt any plan or other arrangement granting any rights 
to any shareholders that would adversely affect in any way MSBC's 
rights under this Plan or the Stock Option Agreement and, in the 
case of MSBC only, it shall not amend the terms of its 
Participating Cumulative Preferred Stock, Series A, of which 
100,000 shares are authorized but unissued as of March 31, 1997, 
in a manner that affects holders of Tysons Common Stock in a 
disproportionate manner;

     (O)  Best Efforts for Merger.  Subject to the terms of this 
Agreement, it undertakes and agrees to use its best efforts to 
cause the Merger to be effected;   	

     (P)  Government Applications.  In the case of MSBC only, it 
shall promptly prepare and submit an application to the FRB and 
the Virginia State Corporation Commission for approval of the 
Merger and promptly make all appropriate filings to secure all 
other approvals, consents and rulings which are necessary for the 
consummation of the Merger by MSBC. Both MSBC and Tysons will use 
their best efforts to obtain and will cooperate with each other 
in making applications for such approvals or other actions 
advisable in the reasonable judgment of MSBC, with the consent of 
Tysons, such consent not to be unreasonably withheld, to 
consummate the Merger including, but not limited to, promptly 

                                  50
<PAGE>


furnishing information relating to it and its Subsidiaries 
required to be set forth therein; provided, however, that any 
approval shall not require a change which materially adversely 
impacts the economic or business benefits to either MSBC or 
Tysons of the transactions contemplated by this Plan so as to 
render inadvisable the consummation of the Merger in the 
reasonable opinion of the Board of Directors of either MSBC or 
Tysons;

     (Q)  Environmental Tests.  Tysons and its Subsidiary will 
allow MSBC to conduct, through designated representatives, 
environmental and engineering tests provided that no test or 
information discovered pursuant thereto shall be deemed to affect 
or modify or waive any representation or warranty made by Tysons;

     (R)  Listing of MSBC Common Stock.  MSBC will use its best 
efforts, prior to the Merger Effective Date, to cause the shares 
of the MSBC Common Stock to be issued to Tysons shareholders in 
connection with the consummation of the Plan, to be listed on the 
NASDAQ/NMS, upon official notice of issuance.

     (S)  Execution of Plan by Holding Company.  Upon the 
incorporation of the Holding Company and its due organization 
subsequent to the date of this Agreement and prior to Merger 
Closing, MSBC shall cause the Holding Company by a duly 
authorized officer to execute this Plan.

     (T)  Tysons Stock Directors Options.  Not less than thirty 
days prior to the Merger Closing each holder of a Directors 

                                  51
<PAGE>


Option shall have entered into a written agreement with Tysons 
for the express benefit of and reasonably satisfactory to MSBC 
agreeing to accept as of the Merger Closing in full satisfaction 
of the optionee's rights under such Directors Option that number 
of shares of MSBC Common Stock equal to the quotient obtained by 
dividing (y) the difference between $14.50 minus the price per 
share at which the optionee could have exercised his option 
rights under the terms of his Directors Option ("Strike Price"), 
by (z) the Average MSBC Share Price ("Option Ratio").  If the 
Option Ratio computed in accordance with the immediately 
preceding sentence is less than the ratio ("Bottom Ratio") 
obtained by dividing (y) the difference between $14.50 minus the 
Strike Price, by (z) $28.60, the Option Ratio shall be the Bottom 
Ratio; if the Option Ratio computed in accordance with the 
immediately preceding sentence is greater than the ratio ("Top 
Ratio") obtained by dividing (y) the difference between $14.50 
minus the Strike Price, (z) by $23.40, the Option Ratio shall be 
the Top Ratio.  As of the Merger Closing, the optionees with 
respect to all outstanding Directors Options shall by agreement 
be entitled to receive from MSBC only the shares of MSBC Common 
Stock as provided in the agreements executed in accordance with 
this Paragraph and shall have no further rights under the terms 
of their Directors Options. 

     (U)  Tysons Warrants.  Tysons shall enter into an agreement 
with each holder of Tysons Warrants, reasonably acceptable to 

                                  52
<PAGE>


MSBC, by which such holder shall agree to exchange each Tysons 
Warrant at least 30 days prior to the Merger Closing for a number 
of shares of Tysons Common Stock per Warrant equal to the 
percentage obtained by dividing (y) the difference between $14.50 
minus the strike price per Warrant by, (z) $14.50.

     (V)  Payment of ESOP Loan.  Prior to the Merger Closing, 
Tysons shall pay or cause to be paid and satisfy in full that 
certain promissory note dated June, 1994, in the initial 
principal amount of $500,000, payable to the order of Richard 
Schwartz and issued by Tysons Financial Corporation Employee 
Stock Ownership Plan and Trust and cause to be discharged in full 
all obligations under that certain Term Loan Agreement dated as 
of June, 1994, pursuant to which such promissory note was issued; 
provided, however, Tysons shall not be obligated to do so until 
the (x) satisfaction of the conditions set forth in Paragraphs 
(A), (B), and (C) of Article VI, (y) such time as Tysons and MSBC 
shall reasonably agree that the Merger Closing will occur prior 
to the public disclosure of such action in regular public 
earnings releases or periodic reports filed with the SEC; and (z) 
such time as MSBC acknowledges in writing that the conditions to 
MSBC's obligation to consummate the Merger (and MSBC's rights to 
terminate this Plan) have been waived or satisfied.


           VI.  CONDITIONS TO CONSUMMATION OF THE MERGER.

     Consummation of the Merger is conditioned upon:

                                  53
<PAGE>


     (A)  Shareholder Approval.  Approval of the Merger and the 
other transactions contemplated hereby (including any actions 
contemplated by Paragraph (L) of Article VIII) by the requisite 
vote of the stockholders of Tysons;

     (B)  Specific Regulatory Approval.  Procurement of the 
approval by the FRB and the Virginia State Corporation Commission 
of the Merger and procurement of all other regulatory consents 
and approvals applicable to financial institutions and their 
holding companies and satisfaction of all other regulatory 
requirements applicable to financial institutions and their 
holding companies necessary for consummation of the Merger, and 
the expiration of the statutory waiting periods relating thereto.

     (C)  General Governmental Approval.  Procurement of all other 
governmental consents and approvals and satisfaction of all other 
requirements prescribed by law which are necessary to the 
consummation of the Merger; provided, however, that no approval or 
consent in Paragraph (B) or (C) of this Article VI shall have imposed 
any condition or requirement which would materially adversely impact 
the economic or business benefits to either MSBC or Tysons of the 
transactions contemplated by this Plan so as to render inadvisable 
the consummation of the Merger;

     (D)  No Countervening Orders.  There shall not be in effect 
any order, decree or injunction of any court or agency of 

                                  54
<PAGE>


competent jurisdiction that enjoins or prohibits consummation of 
the Merger;

     (E)  Accountants' Reports as to MSBC.  Tysons and its 
directors shall have received from Coopers & Lybrand letters, 
dated the date of or shortly prior to (i) the mailing of the 
Proxy Statement, and (ii) the Merger Effective Date, in form and 
substance satisfactory to Tysons with respect to MSBC's 
consolidated financial position and results of operations, which 
letters shall be based upon customary specified procedures 
undertaken by such firm;

     (F)  Accountants' Reports as to Tysons.  MSBC shall have 
received from KPMG Peat Marwick, LLP, dated the date of or 
shortly prior to (1) the mailing of the Proxy Statement, (2) the 
public offerings of any securities by MSBC prior to the Merger 
Effective Date, and (3) the Merger Effective Date, in form and 
substance satisfactory to MSBC with respect to Tyson's financial 
position and results of operations, which letters shall be based 
upon customary specified procedures undertaken by such firm; 

     (G)  MSBC Legal Opinion.  Tysons shall have received an 
opinion, dated the Merger Effective Date, of Flippin, Densmore, 
Morse, Rutherford & Jessee, P.C., counsel for MSBC and the 
Holding Company, in form reasonably satisfactory to Tysons, which 
shall cover the matters contained in Exhibit C hereto;

     (H)  Tysons Legal Opinion.  MSBC and its directors and 
officers who sign the Registration Statement shall have received 

                                  55
<PAGE>


an opinion, dated the Merger Effective Date of Venable, Baetjer 
and Howard, LLP in form reasonably satisfactory to MSBC, which 
shall cover the matters contained in Exhibit D hereto;

     (I)  MSBC Representations and Warranties.  (1) Each of the 
representations and warranties contained herein of MSBC shall be 
true and correct as of the date of this Plan and upon the Merger 
Effective Date with the same effect as though all such 
representations and warranties had been made on the Merger 
Effective Date, except (a) for any such representations and 
warranties made as of a specified date, which shall be true and 
correct as of such date, (b) as expressly contemplated by this 
Plan, or (c) for representations and warranties (other than the 
representations and warranties set forth in Paragraph (A) of 
Article IV, which shall be true and correct in all material 
respects) the inaccuracies of which relate to matters that, 
individually or in the aggregate, do not materially adversely 
affect the Merger and the other transactions contemplated by this 
Plan, and (2) each and all of the agreements and covenants of 
MSBC to be performed and complied with pursuant to this Plan and 
the other agreements contemplated hereby prior to the Merger 
Effective Date shall have been duly performed and complied with 
in all material respects, and Tysons shall have received a 
certificate or certificates signed by the Chief Executive Officer 
and Chief Financial Officer of MSBC dated the Merger Effective 
Date, to such effect;

                                  56
<PAGE>


     (J)  Tysons' Representations and Warranties.  (1) Each of the 
representations and warranties contained herein of Tysons shall 
be true and correct as of the date of this Plan and upon the 
Merger Effective Date with the same effect as though all such 
representations and warranties had been made on the Merger 
Effective Date, except (a) for any such representations and 
warranties made as of a specified date, which shall be true and 
correct as of such date, (b) as expressly contemplated by this 
Plan, or (c) for representations and warranties (other than the 
representations and warranties set forth in Paragraph (A) of 
Article IV, which shall be true and correct in all material 
respects) the inaccuracies of which relate to matters that, 
individually or in the aggregate, do not materially adversely 
affect the Merger and the other transactions contemplated by this 
Plan, and (2) each and all of the agreements and covenants of 
Tysons to be performed and complied with pursuant to this Plan 
and the other agreements contemplated hereby prior to the Merger 
Effective Date shall have been duly performed and complied with 
in all material respects, and MSBC shall have received a 
certificate signed by the Chief Executive Officer and the Chief 
Financial Officer of Tysons dated the Merger Effective Date, to 
such effect;

     (K)  Registration Statement Effectiveness.  The Registration 
Statement shall have become effective and no stop order 
suspending the effectiveness of the Registration Statement shall 

                                  57
<PAGE>


have been issued and no proceedings for that purpose shall have 
been initiated or threatened by the SEC or any other regulatory 
authority;

     (L)  Blue Sky Approvals.  MSBC shall have received all Blue 
Sky Law approvals, permits and other authorizations necessary to 
consummate the Merger;

      (M)  Tax Free Reorganization Opinion.  MSBC and Tysons shall 
have received an opinion from Venable, Baetjer and Howard, LLP to 
the effect that (1) the acquisition of Tysons Common Stock by 
MSBC and the Merger constitutes a reorganization under Section 
368 of the Code, and (2) no gain or loss will be recognized by 
stockholders of Tysons who receive shares of MSBC Common Stock in 
exchange for their shares of Tysons Common Stock except that gain 
or loss may be recognized as to cash received in lieu of 
fractional share interests and, in rendering their opinion, may 
require and rely upon representations contained in certificates 
of officers of MSBC, Tysons and others;

     (N)  Listing of MSBC Common Stock.  The shares of MSBC 
Common Stock issuable pursuant to the Merger shall have been 
approved for listing on the NASDNAQ/NMS, subject to official 
notice of issuance;

     (O)  Affiliate Letters.  MSBC shall have received from each 
affiliate of Tysons the affiliates letter referred to in 
Paragraph (J) of Article V; 

                                  58
<PAGE>


     (P)  Tysons Fairness Opinion.  At the time the Proxy 
Statement is mailed to the holders of shares of Tysons Common 
Stock and on the Merger Effective Date, the Board of Directors of 
Tysons shall have received an opinion from Scott & Stringfellow 
that the terms of the Merger are fair to the shareholders of 
Tysons from a financial point of view;

     (Q)  Exercise of Tysons Warrants.  As of a date which is no 
later than 30 days before the Merger Closing, each and every 
Tysons Warrant shall have been exercised and no Tysons Warrants 
shall be issued and outstanding;

     (R)  Tysons Directors Options.  Each optionee with respect 
to each Tysons Directors Option shall by written agreement with 
Tysons for the express benefit of MSBC shall be entitled to 
receive from MSBC only the shares of MSBC Common Stock provided 
in Paragraph T of Article V.

     (S)  ISO's.  As of a date which is no later than 30 days 
before the Merger Closing, each and every holder of an ISO to 
purchase shares of Tysons Common Stock, to the extent legally 
necessary to allow such conversion, shall have entered into a 
written agreement with Tysons for the express benefit of and 
reasonably acceptable to MSBC obligating such holder to accept 
the conversion of such ISO stock options with respect to MSBC 
Common Stock as contemplated by Paragraph (J) of Article II 
hereof.

                                  59
<PAGE>


     provided, however, that a failure to satisfy any of the 
     conditions set forth in the proviso following Paragraph (C) 
     or in Paragraph (F), (H), (J), (L), (M), (O), or (Q), or 
     (R), or (S) of this Article VI shall only constitute 
     conditions if asserted by MSBC and a failure to satisfy any 
     of the conditions set forth in the proviso following 
     Paragraph (C), Paragraph (E), (G), (I), (M), (N) or (P) of 
     this Article VI shall only constitute conditions if asserted 
     by Tysons.


                         VII.  TERMINATION.

     This Plan may be terminated prior to the Merger Effective 
Date, either before or after receipt of required stockholder 
approval:

     (A)  Mutual Consent.  by the mutual consent of MSBC and 
Tysons, if the Board of Directors of each so determines by vote 
of a majority of the members of its entire Board;

     (B)  On Breach.  By MSBC or Tysons, if its Board of Directors 
so determines by vote of a majority of the members of its entire 
Board, in the event of (1) a breach by the other party of any 
representation or warranty contained herein, which breach cannot 
be or has not been cured within thirty (30) days after the giving 
of written notice to the breaching party of such breach and which 
breaches, individually or in the aggregate, materially adversely 
affect the Merger and the other transactions contemplated by this 

                                  60
<PAGE>


Plan, or (2) a material breach by the other party of any of the 
covenants or agreements contained herein, which breach cannot be 
or has not been cured within thirty (30) days after the giving of 
written notice to the breaching party of such breach; provided, 
however, that a breach can only be asserted as a basis for 
termination pursuant to this paragraph (B) by a party who is not 
itself at such time in breach hereof and provided, further, that 
termination under this Paragraph (B) shall not relieve any party 
from liability under Paragraph (E) of Article VIII;

     (C)  Failure to Consummate on Time.  By MSBC or Tysons, if 
its Board of Directors so determines by vote of a majority of the 
members of its entire Board, in the event that the Merger is not 
consummated by March 31, 1998, and provided, further, that 
termination under this Paragraph (C) shall not relieve any party 
from liability under Paragraph (E) of Article VIII;

     (D)  Failure to Obtain Certain Approvals.  By MSBC or Tysons, 
if its Board of Directors so determines by a vote of a majority 
of the members of its entire Board, in the event that (1) any 
common stockholder approval contemplated by Paragraph (A) of 
Article VI is not obtained at a meeting or meetings called for 
the purpose of obtaining such approval; (2) if any regulatory 
approval contemplated by Paragraph (B) of Article VI to the 
extent necessary to consummate the Merger legally, is finally and 
unconditionally denied; provided, however, that termination under 

                                  61
<PAGE>


this Paragraph (D) shall not relieve any party from liability 
under Paragraph (E) of Article VIII.

     (E)  Failure to Execute Stock Option Agreement.  By MSBC if, 
prior to 5:00 p.m. on June 25, 1997, Tysons does not execute and 
deliver to MSBC the Stock Option Agreement.

     (F)  Possible Adjustment in Exchange Ratio and Option Ratio.  
By Tysons by vote of a majority of the members of its entire 
Board during the ten (10) day period commencing on the 
Determination Date if both of the following conditions are 
satisfied:

          (1)	if the Average MSBC Determination Price 
     for MSBC Common Stock on the Determination Date is 
     less than $23.40; and

          (2)	if the First Percentage exceeds the 
     Second Percentage by at least ten (10) percentage 
     points;

subject, however, to the immediately following four sentences.  
If Tysons elects to exercise its termination right pursuant to 
Paragraph (F) of Article VII, it shall give prompt written notice 
to MSBC (provided that such notice of election to terminate may 
be withdrawn at any time within the aforementioned ten (10) day 
period).  During the seven (7) day period commencing with its 
receipt of such notice, MSBC shall have the option of increasing 
the consideration to be received by the holders of Tysons Common 
Stock (including shares to be acquired pursuant to ISO's)and by 

                                  62
<PAGE>


optionees with respect to Tysons Directors Options by adjusting 
the Exchange Ratio and Option Ratio, respectively, to equal a 
quotient, the numerator of which is $23.40 multiplied by the 
Exchange Ratio (as then in effect) with respect to Tysons Common 
Stock and the Option Ratio (as then in effect) with respect to 
the Directors Options and in either case the denominator of which 
is the Average MSBC Determination Price.  If MSBC makes the 
election contemplated by the immediately preceding sentence, it 
shall give prompt written notice to Tysons of such election and 
the revised Exchange Ratio and Option Ratio, whereupon no 
termination shall have accrued pursuant to this Paragraph (F) and 
the Plan shall remain in effect in accordance with its terms 
(except as the Exchange Ratio or Option Ratio shall have been so 
modified) and any references in this Plan to "Exchange Ratio" or 
"Option Ratio" shall thereafter be deemed to refer to the 
Exchange Ratio or Option Ratio as adjusted pursuant to this 
Paragraph (F).  

     For purposes of this Paragraph (F) the following terms shall 
have the meanings indicated:

     "Average MSBC Determination Price" means the average of the 
bid/asked price for MSBC Common Stock as reported on the 
NASDAQ/NMS for the 20 consecutive full trading days preceding the 
Determination Date.

     "Determination Date" means the tenth day prior to the Merger 
Closing.

                                  63
<PAGE>


     "First Percentage" means the percentage resulting from: (a) 
taking the remainder ("First Remainder") obtained by subtracting 
the Average MSBC Determination Price from $27.875 (the average of 
the bid and asked prices of MSBC Common Stock as reported on the 
NASDAQ/NMS on July 22, 1997; and (b) dividing the First Remainder 
by the Average MSBC Determination Price.

     "Second Percentage" means the percentage resulting from: (a) 
taking the remainder ("Second Remainder") obtained by subtracting 
the SNL Southeast Bank Index reported most recently prior to the 
last trading day in the measuring period for calculating the 
Average MSBC Determination Price ("Recent SNL Bank Index") from 
the SNL Southeast Bank Index at July 22, 1997; and (b) dividing 
the Second Remainder by the Recent SNL Bank Index.


                       	VIII.  OTHER MATTERS.

     (A)  Survival.  If the Merger Effective Date occurs, the 
agreements of the parties in Paragraph (H) of Article II, and 
Paragraphs (A), (C), (D), (F), (I), (J) and (K) of this Article 
VIII shall survive the Merger Effective Date; all other 
representations, warranties, agreements and covenants contained 
in this Plan shall be deemed to be conditions of the Merger and 
shall not survive the Merger Effective Date.  If this Plan is 
terminated prior to the Merger Effective Date, the agreements and 
representations of the parties in Paragraph (K) of Article IV, 
Paragraphs (F)(2) of Article V and Paragraphs (A), (E), (F) and 
(I) of this Article VIII shall survive such termination.  In the 

                                  64
<PAGE>


event of the termination and abandonment of this Plan pursuant to 
the provisions of Article VII, this Plan shall become void and 
have no effect, except (1) as provided in the immediately 
preceding sentence; and (2) no party shall be relieved or 
released from any liability arising out of a breach of any 
provisions of this Plan except as provided in Paragraph (E) of 
this Article.

     (B)  Waiver, Amendment.  Prior to the Merger Effective Date, 
any provision of this Plan may be (1) waived by the party 
benefited by the provision, or (2) amended or modified at any 
time (including the structure of the transaction), by an 
agreement in writing among the parties hereto approved by their 
respective Boards of Directors and executed in the same manner as 
this Plan, except that, after the vote by the stockholders of 
Tysons, the consideration to be received by the stockholders of 
Tysons for each share of Tysons Common Stock shall not be 
decreased (except in accordance with Section 4 of the Plan of 
Merger).

     (C)  Counterparts.  This Plan may be executed in one or more 
counterparts, each of which shall be deemed to constitute an 
original.  This Plan shall become effective when one counterpart 
has been signed by each party hereto.

     (D)  Governing Law.  This Plan shall be governed by, and 
interpreted in accordance with, the laws of the State of 
Virginia.

                                  65
<PAGE>


     (E)  Fees and Expenses.  In the event that the Plan is 
terminated in accordance with the provisions of Article VII 
otherwise than on account of a breach by MSBC or Tysons, each 
party shall bear its own costs, expenses and fees in connection 
with and arising out of the Merger and the other transactions 
contemplated by this Plan (including, without limitation, amounts 
paid or payable to investment bankers, to counsel and 
accountants, and to governmental and regulatory agencies).

     (F)  Confidentiality.  Except as otherwise provided in 
Paragraph (F)(2) of Article V, each of the parties hereto and 
their respective agents, attorneys and accountants will maintain 
the confidentiality of all information provided in connection 
herewith which has not been publicly disclosed.

     (G)  Notices.  All notices, requests and other 
communications hereunder to a party shall be in writing and shall 
be deemed to have been duly given when delivered by hand, 
telegram or facsimile (confirmed in writing) to such party at its 
address set forth below or such other address as such party may 
specify by notice to the parties hereto.

                         If to MSBC or Holding Company, to:
				
                         MainStreet BankGroup Incorporated
                         200 E. Church Street
                         Martinsville, VA 24112-5409
				
                         Attn:  Michael Brenan, 
                                Chief Executive Officer			



                         Copy to:


                                  66
<PAGE>


                                Douglas W. Densmore, Esq.
                                Flippin, Densmore, Morse, Rutherford & Jessee
                                300 First Campbell Square
                                Drawer 1200
                                Roanoke, Virginia 24006



                         If to Tysons, to:	

                                Tysons Financial Corporation
                                8200 Greensboro Drive
                                Suite 100
                                McLean, Virginia 22102
				
                         Attn:  Terrie G. Spiro
                                President


                         Copy to:

                                Elizabeth R. Hughes
                                Venable, Baetjer & Howard, LLP
                                1800 Mercantile Bank & Trust Building
                                2 Hopkins Plaza
                                Baltimore, Maryland 21201
				

     (H)  Definitions.  Any term defined anywhere in this Plan 
shall have the meaning ascribed to it for all purposes of this 
Plan (unless expressly noted to the contrary).  In addition:

          (1)  the term "knowledge" when used with respect to a 
party shall mean the knowledge, after due inquiry, of any 
"Executive Officer" of such party as such term is defined in FRB 
Regulation O;

          (2)  the term "Material Adverse Effect," when applied to 
a party, shall mean an event, occurrence or circumstance 
(including without limitation (a) the making of any provisions 
for possible loan and lease losses, write-downs of other real 

                                  67
<PAGE>


estate and taxes and (b) any breach of a representation or 
warranty by such party) which, in either case, (i) has or is 
reasonably likely to have a material adverse effect on the 
financial position, results of operations or business of the 
party and its subsidiaries, taken as a whole, or (ii) would 
materially impair the party's ability to perform its obligations 
under this Plan or the consummation of the Merger and the other 
transactions contemplated by this Plan; provided, however, that, 
solely for purposes of measuring whether an event, occurrence or 
circumstance has a material adverse effect on such party's 
results of operations, the term "results of operations" shall 
mean net interest income plus non-interest income (less 
securities gains) less gross expenses (excluding provisions for 
possible loan and lease losses, write-downs of other real estate 
and taxes); and provided, further, that material adverse effect 
and material impairment shall not be deemed to include the impact 
of (x) changes in banking and similar laws of general 
applicability or interpretations thereof by courts or 
governmental authorities, (y) changes in generally accepted 
accounting principles or regulatory accounting requirements 
applicable to banks and bank holding companies generally and (z) 
the effects of Merger on the operating performance of the parties 
to this Plan;

          (3)  the term "Previously Disclosed" by a party shall 
mean information set forth in a written disclosure letter that is 

                                  68
<PAGE>


delivered by that party to the other party contemporaneously with 
the execution of this Plan and specifically designated as 
information "Previously Disclosed" pursuant to this Plan; 
provided, further, the mere inclusion of an item in a disclosure 
letter shall not be deemed an admission by a party that such item 
represents a material exception of fact, event or circumstances 
or that such item is reasonably likely to result in a Material 
Adverse Effect.

     (I)  Entire Understanding.  This Plan represents the entire 
understanding of the parties hereto with reference to the 
transactions contemplated hereby and supersede any and all other 
oral or written agreements heretofore made.  Nothing in this Plan 
expressed or implied, is intended to confer upon any person, 
other than the parties hereto or their respective successors, any 
rights, remedies, obligations or liabilities under or by reason 
of this Plan, other than as provided in Paragraph (K) below.

     (J)  Benefit Plans.  Upon consummation of the Merger, as 
soon as administratively practicable employees of Tysons shall be 
entitled to participate in MSBC's pension, severance, benefit and 
similar plans on the same terms and conditions as employees of 
MSBC and its Subsidiaries.  With respect to the MSBC 401(k) plan, 
employees of Tysons shall be given full credit for prior service 
with Tysons with respect to eligibility for and vesting in such 
plan.  MSBC shall cause the Continuing Corporation to honor in 
accordance with their terms as in effect on the date hereof, or 

                                  69
<PAGE>


as amended after the date hereof with the prior written consent 
of MSBC, all employment, severance, consulting and other 
compensation contracts and agreements Previously Disclosed to 
MSBC and executed in writing by both Tysons or TNB on the one 
hand and any individual current or former director, officer or 
employee thereof on the other hand, copies of which have 
previously been delivered by Tysons to MSBC.  In no event shall 
the immediately preceding sentence apply to Tyson's Employee 
Stock Ownership Plan which MSBC presently intends to terminate as 
soon as practicable after the Merger Effective Date.

     (K)  Indemnification.  (1) In the case of MSBC only, it 
agrees that for the period of the relevant statute of limitations 
but in no event less than six-years following the Merger 
Effective Date, it shall cause the Continuing Corporation and any 
successor thereto to indemnify and hold harmless any person who 
has rights to indemnification from Tysons to the same extent and 
on the same conditions as such person is entitled to 
indemnification pursuant to Tysons' Bylaws as in effect on the 
date of this Plan, to the extent legally permitted to do so, with 
respect to matters occurring on or prior to the Merger Effective 
Date (regardless of whether a claim is asserted in connection 
therewith on or prior to the Merger Effective Date or 
thereafter). Without limiting the foregoing, in any case in which 
approval by the Continuing Corporation may be required to 
effectuate any such indemnification, MSBC shall cause the 

                                  70
<PAGE>


Continuing Corporation to direct, at the election of the party to 
be indemnified, that the determination of any such approval shall 
be made by independent counsel mutually agreed upon between MSBC 
and the indemnified party.  MSBC shall use its reasonable best 
efforts to provide coverage to the officers and directors of the 
Continuing Corporation under MSBC policy or policies of director 
and officers liability insurance on the same or substantially 
similar terms then in effect for the directors and officers of 
MSBC and the Continuing Corporation shall reimburse MSBC for the 
additional premium incurred by it in connection with providing 
such coverage; (2) If MSBC or any of its successors or assigns 
shall consolidate with or merge into any other entity and shall 
not be the continuing or surviving entity of such consolidation 
or merger or shall transfer all or substantially all of its 
assets to any entity, then and in each case, proper provisions 
shall be made so that the successors and assigns of MSBC shall 
assume the obligations set forth in this Paragraph (K)(1).  MSBC 
shall pay all reasonable costs, including attorneys' fees, that 
may be incurred by any Indemnified Party in enforcing the 
indemnity and other obligations provided for in this Paragraph 
(K)(1).

     (L)  Acquisition of MSBC.  In the event that MSBC is 
acquired through a merger, share exchange or other business 
combination in which it is not the surviving entity, MSBC agrees 
that it shall make provision by which the acquirer shall assume 

                                  71
<PAGE>


this Agreement and the holders of Tysons Common Shares shall be 
entitled to receive the same consideration for such shares as the 
holders of MainStreet Common Stock received, giving effect to the 
Exchange Ratio and appropriate provision shall be made for the 
holders of Tysons Warrants and Tysons Options.

     IN WITNESS WHEREOF, the parties hereto have caused this 
instrument to be executed in counterparts by their duly 
authorized officers, all as of the day and year first above 
written.

                          MainStreet BankGroup Incorporated


                          /S/ Rebecca J. Jenkins,
                          Executive Vice President and Secretary


                          Tysons Financial Corporation


                          /S/ Terrie G. Spiro,
                          President/Chief Executive Officer

						
                          MB Corp.                    


                          By:_______________________________
                             _______________
                             President

                                  72
<PAGE>

                                                           Annex 1
                                                           to Exhibit A

                                    PLAN OF MERGER


	A.	MB Corp. ("MB") is a corporation organized and existing under the 
laws of the Commonwealth of Virginia.

	B.	Tysons Financial Corporation ("Tysons") is a corporation organized and 
existing under the laws of the Commonwealth of Virginia.

	C.	MB and Tysons, their respective Boards of Directors and shareholders 
have approved a statutory merger ("Merger") of MB (the "Disappearing 
Corporation") with and into Tysons ("the Continuing Corporation").

	1.	Effective Time.  The Merger shall become effective at the time when 
a certificate of merger shall have been issued by the State Corporation 
Commission of the Commonwealth of Virginia (the "Effective Time") but in 
no event before December 31, 1997 and the conditions in Article VI of the 
Agreement and Plan of Merger between the Continuing Corporation, the 
Disappearing Corporation and MainStreet BankGroup Incorporated ("MSBC") 
dated as of July 25, 1997 (the "Agreement") shall have been fulfilled or 
waived.

	2.	Merger.  At the Effective Time, the Disappearing Corporation shall be 
merged with and into the Continuing Corporation in accordance with the 
provisions of Article 12 of the Virginia Stock Corporation Act.  The 
Continuing Corporation shall be and continue in existence as the surviving 
corporation and the separate corporate existence of the Disappearing 
Corporation shall cease.

	3.	Effect of Merger on Outstanding Shares.  The manner of converting or 
cancelling the shares of the Disappearing Corporation and of the Continuing 
Corporation shall, by virtue of the Merger, and without any action on the 
part of the holders thereof be as follows:  

	(A)	The shares of the Disappearing Corporation issued and outstanding as 
of the Effective Time shall be converted into the shares of common stock of 
the Continuing Corporation issued and outstanding as of the Effective Time 
and shall constitute the only issued and outstanding shares of common stock 
of the Continuing Corporation.

	(B)	Each share of the common stock, $5.00 par value per share, of 
Tysons ("Tysons Common Stock") shall be converted into the right to 
receive that number of shares of the common stock, $5.00 par value per 
share, of MainStreet BankGroup Incorporated ("MSBC Common Stock") obtained 
by dividing the Negotiated Price per share of Tysons Common Stock by the 
average of the bid/asked price per share for the MSBC Common Stock as 
reported on the National Association of Securities Dealers Quotations 

                                  73
<PAGE>

System National Market System ("NASDAQ/NMS") for each of the twenty (20)
trading days preceding the later to occur of (i) the approval of
the Merger and the other transactions contemplated by the Agreement by 
the shareholders of Tysons; and (ii) the financial institution regulatory
approvals (but not the statutory waiting periods) necessary for the 
consummation of the Merger and the other transactions contemplated by the 
Agreement.  If the Exchange Ratio computed in accordance with the 
immediately preceding sentence is less than .507, the Exchange Ratio shall 
be .507, and if the Exchange Ratio computed in accordance with the 
immediately preceding sentence is greater than .620, the Exchange Ratio
shall be .620.  ("Exchange Ratio").  The Negotiated Price per share 
of Tysons Common Stock is $14.50.

	(C)	Stockholder Rights; Stock Transfers.  As of the Effective Time, 
holders of the shares of Tysons Common Stock shall cease to be, and shall 
have no rights as, stockholders of Tysons, other than to receive the 
Merger consideration provided under Paragraph (A) above, and the 
consideration provided in Paragraph (D) below.  After the Effective Time, 
there shall be no transfers on the stock transfer books of Tysons or 
the Surviving Corporation of the shares of Tysons Common Stock which were 
issued and outstanding immediately prior to the Effective Time.

	(D)	Fractional Shares.  Notwithstanding any other provision hereof, 
no fractional shares of MSBC Common Stock and no certificates or scrip 
therefor, or other evidence of ownership thereof, will be issued in 
the Merger; instead, MSBC shall pay to each holder of Tysons Common 
Stock who would otherwise be entitled to a fractional share an amount 
in cash determined by multiplying such fractional share by the average 
of the last bid/asked price of MSBC Common Stock on the last trading 
day prior to the Effective Time, as reported on the NASDAQ/NMS (as
reported by The Wall Street Journal).

	(E)	Exchange Procedures.  As promptly as practicable after the 
Effective Time, MSBC shall send or cause to be sent to each former 
holder of Tysons Common Stock of record immediately prior to the 
Effective Time transmittal materials for use in exchanging such 
stockholder's certificates of Tysons Common Stock for the consideration 
set forth in Paragraphs (A) and (D) above.  Any fractional share checks 
which a Tysons stockholder shall be entitled to receive in exchange for 
such stockholder's shares of Tysons Common Stock, and any dividends
paid on any shares of MSBC Common Stock that such stockholder shall be
entitled to receive prior to the delivery to _________________ (the
"Exchange Agent") of such stockholder's certificates representing all of
such stockholder's share of Tysons Common Stock will be delivered to
such stockholder only upon delivery to the Exchange Agent of the
certificates representing all of such shares (or indemnity satisfactory
to MSBC and the Exchange Agent, in their judgment, if any of such 
certificates are lost, stolen or destroyed).  No interest will be

                                    74
<PAGE>

paid on any such fractional share checks or dividends to which the
holder of such shares shall be entitled to receive upon such delivery.
After the Effective Time, to the extent permitted by law, former 
stockholders of record of Tysons shall be entitled to vote at any
meeting of holders of MSBC Common Stock the number of whole shares
of MSBC Common Stock into which their respective shares of Tysons
Common Stock entitle them, regardless of whether such holders have
exchanged their Tysons Common Stock for certificates representing
MSBC Common Stock in accordance with the provisions of this Plan of Merger.

	(F)	Anti-Dilution Provisions.  In the event MSBC changes the 
number of shares of MSBC Common Stock issued and outstanding prior 
to the Effective Time as a result of a stock split, stock dividend, 
recapitalization or similar transaction with respect to the 
outstanding MSBC Common Stock (but not as a result of a merger, share 
exchange or similar transaction) and the record date therefor shall be 
prior to the Effective Time, the Exchange Ratio shall be proportionately 
adjusted.

	(G)	Excluded Shares. Each of the shares of Tysons Common Stock held 
by Tysons, MSBC or any of their respective subsidiaries, in each case 
other than in a fiduciary capacity or as a result of debts previously 
contracted shall be canceled and retired at the Effective Time. 

	(H)	ISO's.  From and after the Effective Time, all stock options 
granted to officers, employees of Tysons in such capacity to purchase 
shares of Tysons Common Stock which are then outstanding and unexercised, 
shall be converted into and become options with respect to MSBC Common 
Stock, and MSBC shall assume each option and right, in accordance with 
the terms of the plan and agreement by which it is evidenced.  From 
and after the Effective Time, (i) each such ISO assumed by MSBC may 
be exercised solely for shares of MSBC Common Stock, (ii) the number
of shares of MSBC Common Stock subject to each ISO shall be equal to
the number of shares of Tysons Common Stock subject to such ISO
immediately prior to the Effective Time multiplied by the Exchange
Ratio, and (iii) the per share exercise price under each such ISO
shall be adjusted by dividing the per share exercise price of each
such ISO by the Exchange Ratio, and rounding to the nearest cent.

	(I)	Tysons Directors Options.  As of the Effective Time, all holders 
of options to purchase Tysons Common Stock granted to directors of 
Tysons in such capacity ("Directors Options") shall receive in full 
satisfaction of the optionee's rights under such Options that number 
of shares of MSBC Common Stock equal to the quotient obtained by 
dividing (x) the difference of $14.50 minus the price per share at 
which the optionee could have exercised his option rights under the 
terms of the Directors Option ("Strike Price"), by (2) the Average
MSBC Share Price ("Option Ratio").  If the Option Ratio computed in
accordance with the immediately preceding sentence is less than the 
ratio ("Bottom Ratio") obtained by dividing (y) the difference of
$14.50 minus the Strike Price by, (z) $28.60, the Option Ratio shall
be the Bottom Ratio; if the Option Ratio computed in accordance with
the immediately preceding sentence is greater than the ratio ("Top
Ratio") obtained by dividing (y) the difference of $14.50 minus

                                  75
<PAGE>

the Strike Price by, (y) $23.40, the Option Ratio shall be the Top Ratio.

(J)	Possible Adjustment in Exchange Ratio and Option Ratio.  The 
Agreement may be terminated prior to the Effective Time (i) as set 
forth in 3 below or (ii) either before or after approval by the 
stockholders of Tysons, by Tysons by vote of a majority of the members 
of its entire Board during the ten (10) day period commencing on the 
Determination Date if both of the following conditions are satisfied:

		(1)	if the Average MSBC Determination Price for MSBC Common Stock 
      on the Determination Date is less than $23.40; and

		(2)	if the First Percentage exceeds the Second Percentage by at 
      least ten (10) percentage points;

subject, however, to the immediately following four sentences.  If 
Tysons elects to exercise its termination right pursuant to clause 
(ii), it shall give prompt written notice to MSBC (provided that such 
notice of election to terminate may be withdrawn at any time within the 
aforementioned ten (10) day period).  During the seven (7) day period 
commencing with its receipt of such notice, MSBC shall have the option 
of increasing the consideration to be received by the holders of Tysons 
Common Stock (including shares to be acquired pursuant to ISO's)
and by optionees with respect to Tysons Directors Options by adjusting 
the Exchange Ratio and Option Ratio, respectively, to equal a quotient, 
the numerator of which is $23.40 multiplied by the Exchange Ratio 
(as then in effect) with respect to Tysons Common Stock and the 
Option Ratio (as then in effect) with respect to the Directors 
Options and the denominator of which in either case is the Average 
MSBC Determination Price.  If MSBC makes an election contemplated by 
the immediately preceding sentence, it shall give prompt written notice 
to Tysons of such election and the revised Exchange Ratio and Option 
Ratio, whereupon no termination shall have accrued pursuant to clause 
(ii) and the Agreement shall remain ineffect in accordance with its 
terms (except as the Exchange Ratio and Option Ratio shall have been 
so modified) and any references in this Plan to "Exchange Ratio" and 
"Option Ratio" shall thereafter be deemed to refer to the Exchange 
Ratio and Option Ratio as adjusted pursuant to this Subparagraph (J).  
For purposes of this Paragraph (J) the following terms shall have 
the meanings indicated:

	"Average MSBC Determination Price" means the average of the bid/asked 
price for MSBC Common Stock as reported on the NASDAQ/NMS for the 20 
consecutive full trading days preceding the Determination Date.

                                 76
<PAGE>

	"Determination Date" means the tenth day prior to the Merger Closing.

	"First Percentage" means the percentage resulting from: (a) taking the 
remainder ("First Remainder") obtained by subtracting the Average MSBC 
Determination Price from $22.875 (the average of the bid and asked prices 
of MSBC Common Stock as reported on the NASDAQ/NMS on July 22, 1997; 
and (b) dividing the First Remainder by the Average MSBC Determination 
Price.

	"Second Percentage" means the percentage resulting from: (a) taking 
the remainder ("Second Remainder") obtained by subtracting the SNL 
Southeast Bank Index reported most recently prior to the last trading 
day in the measuring period for calculating the Average MSBC Price 
("Recent SNL Bank Index") from the SNL Southeast Bank Index at July 22, 
1997; and (b) dividing the Second Remainder by the Recent SNL Bank Index.

	"Merger Closing" means an end of the month date designated by MSBC and 
reasonably acceptable to Tysons after the satisfaction of the conditions 
to the Merger set forth in Paragraphs (A), (B) and (C) of Article VI of 
the Agreement but no later than the Effective Time or before December 31, 
1997.

	(K)	Tysons Warrants.  As of the Merger Closing no warrants to purchase 
Tysons Common Stock shall be outstanding and unexercised.

	3.	Termination of Abandonment.  In addition to the termination provisions 
set forth above, this Plan of Merger shall terminate and the Merger be 
abandoned at any time prior to the Effective Time if the Agreement is 
terminated in accordance with its terms.

	4.	Amendment.  Pursuant to Section 13.1-718(I) of the Virginia Stock 
Corporation Act, the Board of Directors of MSBC and Tysons reserve the 
right to amend this Plan of Merger at any time prior to the issuance by 
the Virginia State Corporation Commission of the certificate of merger; 
provided, however, that any such amendment made subsequent to the 
submission of this Plan of Merger to the shareholders of Tysons, may not:  
(i) alter or change the amount or kind of shares, securities, cash, 
property or rights to be received in exchange for or in conversion of all
or any of the shares of any class or series of such corporation;
(ii) alter or change any of the terms and conditions of this Plan of 
Merger if such alteration or change would adversely affect the shares of 
any class or series of such corporation; or (iii) alter or change any 
term of the articles of incorporation of any corporation (except as 
provided herein) whose shareholders must approve this Plan of Merger.

	5.	Articles of Incorporation and Bylaws.  The Articles of Incorporation 
and Bylaws of the Disappearing Corporation in effect at the Effective 
Time shall continue (until amended or repealed as provided by applicable 

                                  77                                  
<PAGE>

law) to be the Articles of Incorporation and Bylaws of the Continuing 
Corporation after the Effective Time.

	6.	Officers and Directors.  The officers and directors of the Continuing 
Corporation immediately prior to the Effective Time together with such 
additional officers and directors as may thereafter be elected, shall be 
the officers and directors of the Continuing Corporation after the 
Effective Time to serve, in accordance with the Bylaws of the Continuing 
Corporation until their successors are duly elected and qualified or 
their earlier death, resignation or removal. 

                                    78
<PAGE>

                                                              EXHIBIT B

                     Form of Tysons Affiliate's Letter             

                                                     _______________, 19__


MainStreet BankGroup Incorporated
address

Gentlemen:

    Pursuant to the terms of the Agreement and Plan of Merger, 
dated as of ___________, 1997, by and between MainStreet BankGroup 
Incorporated, a Virginia corporation ("MSBC"), MB Corporation, a 
Virginia corporation (the "Holding Company") and Tysons Financial 
Corporation ("Tysons"), (the "Agreement"), the Holding Company, a wholly 
owned subsidiary of MSBC, shall merge with and into Tysons (the "Merger").  
As a result of the Merger the undersigned may receive shares of Common 
Stock, $5.00 par value per share, of MSBC ("MSBC Common Stock").  The
undersigned would receive such shares in exchange for shares owned by the
undersigned of Common Stock, $5.00 par value per share, of Tysons.

	    The undersigned hereby represents, warrants to, and covenants 
with, MSBC that in the event the undersigned receives any MSBC Common 
Stock as a result of the Merger:

   		(A) The undersigned shall not make any sale, transfer or other 
   disposition of the MSBC Common Stock in violation of the Securities Act 
   of 1933, as amended, or the rules and regulations thereunder (the "Act").

   		(B)	The undersigned has carefully read this letter and discussed its 
   requirements and other applicable limitations upon the undersigned's 
   ability to sell, transfer or otherwise dispose of MSBC Common Stock to 
   the extent the undersigned felt necessary, with the undersigned's counsel 
   or counsel for Tysons.

   		(C)	The undersigned will not sell, transfer or otherwise dispose of 
   MSBC Common Stock issued to the undersigned in the Merger unless (i) 
   such sale, transfer or other disposition has been registered under the 
   Act, (ii) such sale, transfer or other disposition is made in conformity 
   with the provisions of Rule 145 under the Act (as such rule may be 
   hereafter from time to time be amended), or (iii) in the opinion of 
   counsel in form and substance reasonably acceptable to MSBC, in which 
   counsel for MSBC concurs, or in a "no-action" letter obtained by the

                                  B-1
                                   79
<PAGE>

   undersigned from the staff of the Securities and Exchange Commission
   (the "Commission"), a determination is made that such sale, transfer 
   or other disposition will not violate or is otherwise exempt from 
   registration under the Act.

    		(D)	The undersigned understands that MSBC is under no obligation 
   to register the sale, transfer or other disposition of shares of 
   MSBC Common Stock by the undersigned or on the undersigned's behalf 
   under the Act or to take any other action necessary in order to make 
   compliance with an exemption from such registration available.

    		(E)	The undersigned also understands that stop transfer instructions 
   will be given to MSBC's transfer agent with respect to MSBC Common 
   Stock owned by the undersigned and that there will be placed on the 
   certificates for the MSBC Common Stock issued to the undersigned, or 
   any substitutions therefor, a legend stating in substance:

          			"The shares represented by this certificate were issued 
        in a transaction to which Rule 145(d) under the Securities 
        Act of 1933 applies.  The shares represented by this certificate 
        may only be transferred in accordance with the terms of a letter 
        agreement dated __________________, 199___ between the registered 
        holder hereof and MainStreet BankGroup Incorporated, a copy of 
        which agreement is on file at the principal offices of MainStreet 
        BankGroup Incorporated."

    		(F)	The undersigned also understands that unless the transfer 
    by the undersigned of the undersigned's MSBC Common Stock has 
    been registered under the Act or is a sale made in conformity 
    with the provisions of Rule 145(d) under the Act, MSBC reserves 
    the right, in its sole discretion, to place the following legend 
    on the certificates issued to any transferee of shares from the 
    undersigned:

       			   "The shares represented by this certificate have not 
         been registered under the Securities Act of 1933 and were 
         acquired from a person who received such shares in a transaction 
         to which Rule 145 under the Securities Act of 1933 applies.  
         The shares have been acquired by the holder not with a view to, 
         or for resale in connection with, any distribution thereof 
         
                                  B-2
                                   80
<PAGE>

         within the meaning of the Securities Act of 1933 and may not be 
         offered, sold, pledged or otherwise transferred except in 
         accordance with an exemption from the registration requirements 
         of the Securities Act of 1933."

      It is understood and agreed that the legends set forth in 
    paragraphs (E) and (F) above shall be removed by delivery of 
    substitute certificates without such legend if the undersigned shall 
    have delivered to MSBC (i) a copy of a "no action" letter from the 
    staff of the Commission, or an opinion of counsel in form and substance 
    reasonably satisfactory to MSBC, in which counsel for MSBC concurs, 
    to the effect that such legend is not required for purposes of the 
    Act, or (ii) reasonably satisfactory evidence or representations that
    the shares represented by such certificates are being or have been 
    transferred in a transaction made in conformity with the provisions
    of Rule 145(d).

                                    							Very truly yours,

                                    						
                                          	____________________________
                                    							Name:

                                    							[add below the signatures of 
                                           all registered owners (other 
                                           than nominee) of shares deemed 
                                           beneficially owned by the 
                                           affiliate]

                                    						
                                           ____________________________
                                    							Name:

                                    						
                                          	____________________________
                                    							Name:

                                    						
                                          	____________________________
                                    							Name:


Acknowledged this ___ day of
___________________, 199___.

MAINSTREET BANKGROUP INCORPORATED

By: ________________________
    Name:
    Title:

                                    B-3
                                     81
<PAGE>
                                                           EXHIBIT C 

     The opinion of counsel for MainStreet BankGroup Incorporated 
("MSBC") contemplated in Paragraph (G) of Article VI of the Agreement 
and Plan of Merger to which this EXHIBIT C is attached (the "Plan") 
shall be to the following effect (all terms used herein which are 
defined in the Plan have the meanings set forth therein):

	    (A)	MSBC and MB Corporation (the "Holding Company") are 
each corporations duly organized and existing in good standing under 
the laws of the Commonwealth of Virginia;

     	(B)	MSBC and the Holding Company have the corporate power and 
authority to carry on their respective business as it is now being 
conducted and to own all their respective material property and assets;

     	(C)	the outstanding shares of capital stock of MSBC and of Holding 
Company are validly issued and outstanding, fully paid and nonassessable 
and subject to no preemptive rights.  Except as Previously Disclosed, 
there are no outstanding options, warrants, rights to subscribe to or 
securities convertible into shares of MSBC Common Stock.  Except for 
_____________________________, there are no shares of MSBC Preferred 
Stock outstanding and except as Previously Disclosed there are no 
outstanding options, warrants, rights to subscribe to or securities
or rights convertible into shares of MSBC Preferred Stock.

                                   C-1
                                    82        

      (D)	MSBC and the Holding Company have each taken all required 
corporate action to approve and adopt the Plan and the Plan is a 
valid and binding agreement of it enforceable against it in accordance 
with the terms of the Plan, subject to bankruptcy, insolvency, 
fraudulent transfer, moratorium and other laws of general applicability 
relating to or affecting creditors' rights in general and to general 
equity principles (provided, however, that such counsel need not render 
any such opinion with respect to any indemnification provisions);

      (E)  the execution, delivery and performance of the Plan by MSBC 
and by the Holding Company, respectively, did not, and the consummation of 
the transactions contemplated thereby by them does not, constitute 
(i) to the knowledge of such counsel, a breach or violation of, or a 
default under, any law, rule or regulation or any judgment, decree, 
order, governmental permit or license, or agreement, indenture or 
instrument of MSBC or any of its subsidiaries or to which it or any of 
its subsidiaries is subject, which breach, violation or default to the
knowledge of such counsel would have a Material Adverse Effect 
on MSBC or (ii) a breach or violation of or a default under the 
Articles of Incorporation or Bylaws of MSBC or of Holding Company; 
and, (iii) to such counsel's knowledge, the consummation of the 
transactions contemplated by the Plan, does not require any 
material consent or approval under any such law, rule, regulation, 
judgment, decree, order, governmental permit or license or, 

                                C-2
                                 83

except as Previously Disclosed, the material consent or approval of
any other party to any such agreement, indenture or instrument,
other than required approvals of the appropriate federal and state 
regulatory authorities, and required filings under the federal 
securities laws and under the state "blue sky" or securities laws 
which have been made or received and are in full force and effect;

     (F)	except as Previously Disclosed or as reflected in 
the Financial Reports, (i) to such counsel's knowledge, there 
is no litigation, proceeding or controversy before any court or 
governmental agency pending against MSBC or any of its subsidiaries 
with respect to the transactions contemplated by the Plan by a 
governmental authority which is reasonably likely to have a Material 
Adverse Effect on MSBC and, to the knowledge of such counsel, no such 
litigation, proceeding or controversy has been threatened or is
contemplated, (ii) neither MSBC nor any of its subsidiaries is subject
to any (as to MSBC and its subsidiaries taken as a whole) order, decree, 
agreement, memorandum of understanding or similar arrangement with, or 
commitment letter or similar submission to, any federal or state 
governmental agency or authority charged with the supervision or 
regulation of depository institutions or engaged in the insurance 
of deposits which restricts or purports to restrict in any material 
respect the conduct of the business of it or any of its subsidiaries 
or properties, or in any manner relates to the capital, liquidity, 
credit policies or management of it or any of its subsidiaries; and 
(iii) to the knowledge of such counsel neither MSBC nor any 

                                 C-3
                                  84

of its subsidiaries has been advised by any such regulatory authority 
that such authority is contemplating issuing or requesting (or is 
considering the appropriateness of issuing or requesting) any such 
order, decree, agreement, memorandum of understanding, commitment 
letter or similar submission;

     (G)  the regulatory consents set forth in Paragraphs B and C of 
Article VI of the Plan, necessary to permit the consummation of the 
Plan, have been secured and are in full force and effect;

      (H)  the Registration Statement and Prospectus included 
therein, as of the effective date of the Registration Statement, 
complied in all material respects as to form with the provisions 
of the Federal Securities Laws.  Further such counsel does 
not believe that, insofar as they relate to MSBC and its 
subsidiaries, the Registration Statement and Prospectus, on such 
effective date, contained any untrue statement of a material fact or 
omitted to state any material fact required to be stated therein or 
necessary to make the statements therein not misleading.  
(Such opinion may state that such counsel does not assume 
any responsibility for the accuracy or fairness of the statements 
contained in the Registration Statement and Prospectus and that 
he does not express any opinion or belief as to material in the 
Registration Statement insofar as it includes or reflects any 
information relating to or supplied by entities other 
than MSBC or its subsidiaries or as to any financial statements 
or other financial data contained in the Registration Statement 
and prospectus); and

     (I)  the shares of MSBC Common Stock to be issued 
in exchange for shares of Tysons Common Stock upon 
consummation of the Merger have been duly authorized and, 
when issued in accordance with the terms of the Plan, will be 
validly issued, fully paid and nonassessable and subject to 
no preemptive rights.

                                  C-4
                                   85
<PAGE>
                                                             EXHIBIT D

     The opinion of counsel for Tysons Financial Corporation 
contemplated in Paragraph (H) of Article VI of the Agreement 
and Plan of Merger to which this Exhibit D is attached (the "Plan") 
shall be to the following effect (all terms used herein which 
are defined in the Plan have the meanings set forth therein):

     (A)  Tysons is a corporation duly organized and 
existing in good standing under the laws of the Commonwealth 
of Virginia; and is authorized to do business in Virginia as a bank 
holding company within the meaning of the federal Bank Holding 
Company Act of 1956, as amended, and Chapter 13 of the 
Virginia Banking Act;

     (B)  Tysons National Bank ("TNB") is a duly organized 
national banking association, existing in good standing under 
the laws of the United States. 

     (C)  Tysons and TNB each have the corporate power 
and authority to carry on their respective business as it is 
now being conducted and to own all their respective material 
property and assets;

     (D)  the authorized capital stock of Tysons consists 
of 10,000,000 shares of common stock, $5.00 par value per 
share, of which 1,071,119 shares are issued and outstanding 
as of the date hereof and ________ shares are reserved for 
issuance as set forth on Schedule I attached hereto; the authorized 
capital stock of TNB consists of _______ shares of common stock, 
$______ par value per share ("TNB Common Stock"), of which 

                             D-1
                              86
<PAGE>

______ shares are issued and outstanding as of the date hereof and 
no shares are reserved for issuance as set forth on Schedule I attached 
hereto.  The outstanding shares of Tysons Common Stock and TNB 
Common Stock have been duly authorized and validly issued and are 
fully paid and nonassessable and are subject to no preemptive rights.  
All of the issued and outstanding shares of TNB Common Stock are 
held of record by Tysons.  Except for the warrants described in the 
next following sentence, there are no outstanding options, warrants, 
rights to subscribe to or securities or rights convertible into shares 
of Tysons Common Stock (other than the Options) or TNB Common 
Stock.  Tysons has issued and outstanding as of the date hereof 
warrants to purchase up to 347,850 shares of Tysons Common 
Stock at $10.00 per share.  The holders of these warrants are, as 
of the date hereof, obligated to redeem them in accordance with 
the provisions of Paragraph (S) of Article VI of the Agreement.

    (E)  Tysons has taken all required corporate action to 
approve and adopt the Plan and the Stock Option Agreement, 
and the Plan and the Stock Option Agreement are valid and binding 
agreements of it enforceable against it in accordance with their respective 
terms, subject to bankruptcy, insolvency, fraudulent transfer, moratorium 
and other laws of general applicability relating to or affecting creditors' 
rights in general, and to general equity principles (provided, however, that 

                                  D-2
                                   87
<PAGE>

such counsel need not render any such opinion with respect to any 
indemnification provisions);

    (F)  the execution, delivery and performance of the Plan and 
Stock Option Agreement by Tysons did not, and the consummation of 
the transactions contemplated thereby by such agreements does not, 
constitute or result in (i) to the knowledge of such counsel, a breach or 
violation of, or a default under any law, rule or regulation or any 
judgment, decree, order, governmental permit or license, or agreement, 
indenture or instrument of Tysons or TNB or to which Tysons or TNB 
is subject, which breach, violation or default to the knowledge of such 
counsel would have a Material Adverse Effect on Tysons or TNB; (ii) 
a breach or violation of, or a default under, the Articles of Incorporation 
or Bylaws of Tysons or TNB; (iii) to the knowledge of such counsel, 
the consummation of the transactions contemplated by the Plan and the 
Stock Option Agreement, does not require any material consent or 
approval under any such law, rule, regulation, judgment, decree, order, 
governmental permit or license or, except as Previously Disclosed, the 
material consent or approval of any other party to any such agreement, 
indenture or instrument, other than the required approvals or the 
appropriate federal and state regulatory authorities, and required 
filings under the federal securities laws and under the state "blue sky" 
or securities laws, and (iv) result in the grant of any rights to any person 
under the Articles of Incorporation or Bylaws of Tysons or TNB or, to 

                                  D-3
                                   88
<PAGE>

the knowledge of such counsel, under any agreement to which Tysons 
or TNB is a party;

     (G)  Tysons has taken all necessary action to exempt 
the transactions contemplated by the Plan and the Stock 
Option Agreement from any applicable take over, business 
combination, control share acquisition or similar law in effect 
under the laws of the Commonwealth of Virginia as of the date 
hereof, including without limitation Articles 14 and 14.1 of the 
Virginia Stock Corporation Act;

     (H)  except as Previously Disclosed or as reflected in the 
Financial Reports, (i) to such counsel's knowledge, there is no litigation, 
proceeding or controversy before any court or governmental agency 
pending against Tysons or TNB by a governmental authority which is 
reasonably likely to have a Material Adverse Effect on Tysons and, to the 
knowledge of such counsel, no such litigation, proceeding or controversy 
has been threatened or is contemplated, (ii) except as Previously Disclosed 
Tysons and TNB are not subject to any order, decree, agreement, memorandum 
of understanding or similar arrangement with, or a commitment letter or 
similar submission to, any federal or state governmental agency or authority 
charged with the supervision or regulation of depository institutions or 
engaged in the insurance of deposits which restricts or purports to restrict 
in any material respect the conduct of their respective business or 
properties, or in any manner relates to their respective capital, 
liquidity, credit policies or management; and (iii) to the knowledge 
of such counsel and except as Previously Disclosed, Tysons and TNB 

                                  D-4
                                   89
<PAGE>

have not been advised by any such regulatory authority that such 
authority is contemplating issuing or requesting (or is considering 
the appropriateness of issuing or requesting) any such order, decree, 
agreement, memorandum of understanding, commitment letter or similar 
submission;

     (I)  the Proxy Statement (including any documents relating 
to Tysons and TNB incorporated by reference therein), as of the 
mailing date thereof, complied in all material respects as to form with 
the requirements of all applicable laws, rules, and regulations.  Further, 
such counsel does not believe that, insofar as it relates to Tysons and 
TNB, the Proxy Statement, on such mailing date, contained any untrue 
statement of a material fact or omitted to state any material fact 
required to be stated therein or necessary to make the statements 
therein not misleading.  (Such opinion may state that such counsel 
does not assume any responsibility for the accuracy or fairness of 
the statements contained in the Proxy Statement and that he does not 
express any opinion or belief as to material in the Proxy Statement 
insofar as it includes or reflects any information relating to or supplied 
by entities other than Tysons and TNB or as to any financial statements 
or other financial data contained in the Proxy Statement); 

     (J)  except as Previously Disclosed, to the knowledge of such counsel 
there are no persons who may be deemed to be "affiliate" of Tysons within 

                                  D-5
                                   90
<PAGE>

the meaning of Rule 145 under the Securities Act.

                                  
                                  D-6
                                   91
<PAGE>

                                                             EXHIBIT E

                           STOCK OPTION AGREEMENT


     STOCK OPTION AGREEMENT, dated as of _____________, 1997 
(the "Agreement"), by and between Tysons Financial Corporation 
("Issuer"), and MainStreet BankGroup, Incorporated, a Virginia 
corporation ("Grantee").

     WHEREAS, Grantee and Issuer have entered into an Agreement and 
Plan of Merger dated as of ____________, 1997 (the "Plan"), providing 
for, among other things, the merger of Issuer with and into a 
wholly-owned subsidiary of Grantee, with Issuer as the surviving 
corporation; and

     WHEREAS, as a condition and inducement to Grantee's execution of the 
Plan, Grantee has required that Issuer agree, and Issuer has agreed, 
to grant Grantee the Option (as defined below);

    	NOW, THEREFORE, in consideration of the foregoing and 
the respective representations, warranties, covenants and agreements
set forth herein and in the Plan, and intending to be legally bound 
hereby, Issuer and Grantee agree as follows:

     1.	Defined Terms.  Capitalized terms which are used but 
not defined herein shall have the meanings ascribed to such terms in 
the Plan.

     2.	Grant of Option.  Subject to the terms and conditions 
set forth herein, Issuer hereby grants to Grantee an irrevocable 
option (the "Option") to purchase up to ________ shares (as adjusted 
as set forth herein) (the "Option Shares", which shall include the 
Option Shares before and after any transfer of such Option Shares) 
of Common Stock, $5.00 par value per share ("Issuer Common 
Stock"), of Issuer at a purchase price per Option Share (the 
"Purchase Price") equal to the first closing price per share of Issuer 
Common Stock following public announcement of the execution of 
the Plan as reported on the National Association of Securities 
Dealers Small Cap Market ("NASD/SCM").

    	3.	Exercise of Option.

      		(a)	Provided that (i) Grantee shall not be in material 
breach of the agreements or covenants contained in this Agreement 
or the Plan, and (ii) no preliminary or permanent injunction or other 
order against the delivery of shares covered by the Option issued by 
any court of competent jurisdiction in the United States shall be in 
effect, Grantee may exercise the Option, in whole or in part, at any 
time and from time to time following the occurrence of a Purchase 
Event; provided that the Option shall terminate and be of no further 
force and effect upon the earliest to occur of (a) the Merger Effective 

                                  92
<PAGE>

Date, (b) termination of the Plan in accordance with the terms 
thereof prior to the occurrence of a Purchase Event or a Preliminary 
Purchase Event (other than a termination of the Plan by Grantee 
pursuant to Paragraph (B)(i) or Paragraph (B)(ii) of Article VII 
thereof or by Grantee and Issuer pursuant to Paragraph (A) of Article 
VII thereof if Grantee shall at that time have been entitled to 
terminate the Plan pursuant to Paragraph (B)(i) or Paragraph (B)(ii) 
of Article VII thereof (a "Default Termination")); (c) 12 months after 
the termination of the Plan by Grantee pursuant to a Default 
Termination (provided, however, that if within 12 months after such 
termination of the Plan a Purchase Event or a Preliminary Purchase 
Event shall occur, then notwithstanding anything to the contrary 
contained herein (including clause (d) of this sentence), this Option 
shall terminate 12 months after the first occurrence of such an event), 
(d) 12 months after termination of the Plan (other than pursuant to a 
Default Termination) following the occurrence of a Purchase Event 
or a Preliminary Purchase Event and (e) December 31, 1998 (subject 
to the proviso in clause (c) of this sentence); and provided, further, 
that any purchase of shares upon exercise of the Option shall be 
subject to compliance with applicable law, including, without 
limitation, the Bank Holding Company Act of 1956, as amended (the 
"BHC Act").  The rights set forth in Section 8 shall terminate when 
the right to exercise the Option terminates (other than as a result of a 
complete exercise of the Option) as set forth herein.

        (b)	As used herein, a "Purchase Event" means any of the 
following events:

            (i)	Without Grantee's prior written consent, Issuer 
shall have authorized, recommended, publicly proposed or publicly 
announced an intention to authorize, recommend or propose, or 
entered into an agreement with any person (other than Grantee or 
any subsidiary of Grantee) to effect an Acquisition Transaction (as 
defined below).  As used herein, the term Acquisition Transaction 
shall mean (a) a merger, consolidation or similar transaction 
involving Issuer or any of its subsidiaries (other than transactions 
solely between Issuer's subsidiaries), (b) the disposition, by sale, 
lease, exchange or otherwise, of assets of Issuer or any of its 
subsidiaries or (c) the issuance, sale or other disposition of 
(including by way of merger, consolidation, share exchange or any 
similar transaction) securities representing 20% or more of the 
voting power of Issuer or any of its subsidiaries (any of the foregoing 
an "Acquisition Transaction"); or

            (ii)	any person (other than Grantee or any subsidiary of 
Grantee) shall have acquired beneficial ownership (as such term is 
defined in Rule 13d-3 promulgated under the Exchange Act of or the 
right to acquire beneficial ownership of, or any "group" 
(as such term is defined under the Exchange Act) shall have been 
formed which beneficially owns or has the right to acquire beneficial 
ownership of, 25% or more of the then outstanding shares of Issuer 
Common Stock.

                                    2
                                   93
<PAGE>

        (c)	As used herein, a "Preliminary  Purchase Event" means 
any of the following events:

          		(i)	any person (other than Grantee or any subsidiary of 
Grantee) shall have commenced (as such term is defined in Rule 14d-2 
under the Exchange Act) or shall have filed a registration statement 
under the Securities Act, with respect to, a tender offer or exchange 
offer to purchase any shares of Issuer Common Stock such that, upon 
consummation of such offer, such person would own or control 25% or 
more of the then outstanding shares of Issuer Common Stock (such an 
offer being referred to herein as a "Tender Offer" or an "Exchange 
Offer," respectively); or

           		(ii)	the holders of Issuer Common stock shall not 
have approved the Plan at the meeting of such stockholders held for
the purchase of voting on the Plan, such meeting shall not have been 
held or shall have been canceled prior to termination of the Plan or 
Issuer's Board of Directors shall have withdrawn or modified in a 
manner adverse to Grantee the recommendation of Issuer's Board of 
Directors with respect to the Plan, in each case after it shall have 
been publicly announced that any person (other than Grantee or any 
subsidiary of Grantee) shall have (a) made, or disclosed an intention 
to make, a proposal to engage in an Acquisition Transaction, (b) 
commenced a Tender Offer or filed a registration statement under the 
Securities Act with respect to an Exchange Offer or (c) filed an 
application (or given a notice), whether in draft or final form, under 
the BHC Act, the Bank Merger Act or the Change in Bank Control 
Act of 1978, for approval to engage in an Acquisition Transaction.

As used in this Agreement, "person" shall have the meaning 
specified in Sections 3(a)(9) and 13(d)(3) of the Exchange Act.

        (d)	In the event Grantee wishes to exercise the Option, it 
shall send to Issuer a written notice (the date of which being herein 
referred to as the "Notice Date") specifying (i) the total number of 
Option Shares it intends to purchase pursuant to such exercise and 
(ii) a place and date not earlier than three business days nor later than 
15 business days from the Notice Date for the closing (the 
"Closing") of such purchase (the "Closing Date").  If prior 
notification to or approval oft he Board of Governors of the Federal 
Reserve System (the "Federal Reserve Board") or any other 
regulatory authority is required in connection with such purchase, 
Issuer shall cooperate with Grantee in the filing of the required 
notice of application for approval and the obtaining of such approval 
and the Closing shall occur immediately following such regulatory 
approvals (and any mandatory waiting periods).

	4.	Payment and Delivery of Certificates.

                                     3
                                     94
<PAGE>

  		(a)	On each Closing Date, Grantee shall (i) pay to 
Issuer, in immediately available funds by wire transfer to a bank 
account designated by Issuer, an amount equal to the Purchase Price 
multiplied by the number of Option Shares to be purchased on such 
Closing Date, and (ii) present and surrender this Agreement to the 
Issuer at the address of the Issuer specified in Section 12(f) hereof.

  		(b)	At each Closing, simultaneously with the delivery of immediately 
available funds and surrender of this Agreement as provided in Section 
4(a), (i) Issuer shall deliver to Grantee (a) a certificate or 
certificates representing the Option Shares to be purchased at such 
Closing, which Option Shares shall be free and clear of all liens, 
claims, charges and encumbrances of any kind whatsoever and subject 
to no preemptive rights, and (b) if the Option is exercised in part 
only, an executed new agreement with the same terms as this Agreement 
evidencing the right to purchase the balance of the shares of Issuer 
Common Stock purchasable hereunder, and (ii) Grantee shall deliver 
to Issuer a letter agreeing that Grantee shall not offer to sell or 
otherwise dispose of such Option Shares in violation of applicable 
federal and state law or of the provisions of this Agreement.

    	(c)	In addition to any other legend that is required 
by applicable law, certificates for the Option Shares delivered at 
each Closing shall be endorsed with a restrictive legend which shall 
read substantially as follows:

THE TRANSFER OF THE STOCK REPRESENTED BY THIS CERTIFICATE IS SUBJECT 
TO RESTRICTIONS ARISING UNDER THE SECURITIES ACT OF 1933, AS AMENDED, 
AND PURSUANT TO THE TERMS OF A STOCK OPTION AGREEMENT DATED AS 
OF ______________________.  A COPY OF SUCH AGREEMENT WILL BE PROVIDED 
TO THE HOLDER HEREOF WITHOUT CHARGE UPON RECEIPT BY THE ISSUER OF A 
WRITTEN REQUEST THEREFOR.

It is understood and agreed that the above legend shall be removed 
by delivery of substitute certificate(s) without such legend if Grantee 
shall have delivered to Issuer a copy of a letter from the staff of the 
SEC, or an opinion of counsel in form and substance reasonably 
satisfactory to Issuer and its counsel, to the effect that such legend is 
not required for purposes of the Securities Act.

     5.	Representations and Warranties of Issuer.  Issuer hereby 
represents and warrants to Grantee as follows:

      		(a)	Due Authorization.  Issuer has all requisite corporate power 
and authority to enter into this Agreement and, subject to any approvals 

                                     4
                                     95
<PAGE>

referred to herein, to consummate the transactions contemplated hereby.  
The execution and delivery of this Agreement and the consummation of 
the transactions contemplated hereby have been duly authorized by 
all necessary corporate action on the part of Issuer.  This Agreement 
has been duly executed and delivered by Issuer.

      	(b) Authorized Stock.  Issuer has taken all necessary corporate 
and other action to authorize and reserve and to permit it to issue, 
and, at all times from the date hereof until the obligation to deliver 
Issuer Common Stock upon the exercise of the Option terminates, will 
have reserved for issuance, upon exercise of the Option, the number of 
shares of Issuer Common Stock necessary for Grantee to exercise the 
Option, and Issuer will take all necessary corporate action to authorize 
and reserve for issuance all additional shares of Issuer Common Stock 
or other securities which may be issued pursuant to Section 7 upon 
exercise of the Option.  The shares of Issuer Common Stock to be 
issued upon due exercise of the Option, including all additional 
shares of Issuer Common Stock or other securities which may be issuable 
pursuant to Section 7, upon issuance pursuant hereto, shall be duly and 
validly issued, fully paid and nonassessable, and shall be delivered free 
and clear of all liens, claims, charges and encumbrances of any kind or 
nature whatsoever, including any preemptive rights of any stockholder 
of Issuer.

     6.	Representations and Warrants of Grantee.  Grantee hereby represents 
and warrants to Issuer that:

      		(a)	Due Authorization.  Grantee has all requisite corporate 
power and authority to enter into this Agreement and, subject to any 
approvals or consents referred to herein, to consummate the transactions 
contemplate hereby.  The execution and delivery of this Agreement and 
the consummation of the transactions contemplated hereby have been duly 
authorized by all necessary corporate action on the part of Grantee.  
This Agreement has been duly executed and delivered by Grantee.

      		(b)	Purchase Not for Distribution.  This Option is not being, 
and any Option Shares or other securities acquired by Grantee upon 
exercise of the Option will not be, acquired with a view to the public 
distribution thereof and will not be transferred or otherwise disposed 
of except in a transaction registered or exempt from registration under 
the Securities Act.
	
     7.	Adjustment upon Changes in Capitalization, etc.

      		(a)	In the event of any change in Issuer Common Stock by reason 
of a stock dividend, stock split, split-up, recapitalization, combination, 
exchange of shares or similar transaction, the type and number of shares 
or securities subject to the Option, and the Purchase Price therefor, 

                                    5
                                    96
<PAGE>

shall be adjusted appropriately, and proper provision shall be made 
in the agreements governing such transaction so that Grantee shall 
received, upon exercise of the Option, the number and class of shares 
or other securities or property that Grantee would have received in 
respect of Issuer Common Stock of the Option had been exercised immediately 
prior to such event, or the record date therefor, as applicable.  If any 
additional shares of Issuer Common Stock are issued after the date of 
this Agreement (other than pursuant to an event described in the first 
sentence of this Section 7(a)), the number of shares of Issuer 
Common Stock subject to the Option shall be adjusted so that, after 
such issuance, it, together with any shares of Issuer Common Stock 
previously issued pursuant hereto, equals 19.9% of the number of 
shares of Issuer Common Stock then issued and outstanding, without 
giving effect to any shares subject to or issued pursuant to the 
Option.

     		(b)	In the event that Issuer shall enter in an agreement:  
(i) to consolidate with or merge into any person, other than Grantee 
or one of its subsidiaries, and shall not be the continuing or surviving 
corporation of such consolidation or merger, (ii) to permit any person, 
other than Grantee or one of its subsidiaries, to merge into Issuer 
and Issuer shall be the continuing or surviving corporation, but, 
in connection with such merger, the then outstanding shares of Issuer 
Common Stock shall be changed into or exchanged for stock or other 
securities of Issuer or any other person or cash or any other property 
or the outstanding shares of Issuer Common Stock immediately prior to 
such merger shall after such merger represent less than 50% of the 
outstanding shares and share equivalents of the merged company, or 
(iii) to sell or otherwise transfer all or substantially all of its 
assets to any person, other than Grantee or one of its subsidiaries, 
then, and in each such case, the agreement governing such transaction 
shall make proper provisions so that upon the consummation of any such 
transaction and upon the terms and conditions set forth herein, the 
Grantee shall receive for each Option Share with respect to which the 
Option has not been exercised an amount of consideration in the form 
of and equal to the per share amount of consideration that would be 
received by the holder of one share of Issuer Common Stock less the 
Purchase Price (and, in the event of an election or similar arrangement 
with respect to the type of consideration to be received by the holders 
of Issuer Common Stock, subject to the foregoing, proper provision shall be 
made so that the holder of the Option would have the same election 
or similar rights as would the holder of the number of shares of 
Issuer Common Stock for which the Option is then exercisable).

     		 (c)	Issuer shall not enter into any agreement of the 
type described in Section 7(b) unless the other party thereto commits 
to provide the funding required for Issuer to pay the Section 8 
Repurchase Consideration.

     8.	Repurchase at the Option of Grantee.

                                   6
                                   97
<PAGE>

        (a)	Subject to the last sentence of Section 3(a), at 
the request of Grantee at any time commencing upon the first 
occurrence of a Repurchase Event (as defined in  Section 8(d)) and 
ending 12 months immediately thereafter, Issuer shall repurchase 
from Grantee (i) the Option and (ii) all shares of Issuer Common 
Stock purchased by Grantee pursuant hereto with respect to which 
Grantee then has beneficial ownership.  The date on which Grantee 
exercises its rights under this Section 8 is referred to as the "Request 
Date".  Such repurchase shall be at an aggregate price (the "Section 8 
Repurchase Consideration") equal to the sum of:

            (i)	the aggregate Purchase Price paid by Grantee for any 
shares of Issuer Common Stock acquired pursuant to the Option with 
respect to which Grantee then has beneficial ownership;

         			(ii)	the excess, if any, of (x) the Applicable Price (as 
defined below) for each share of Issuer Common Stock over (y) the 
Purchase Price (subject to adjustment pursuant to Section 7), 
multiplied by the number of shares of Issuer Common Stock with 
respect to which the Option has not been exercised; and

         			(iii)	 the excess, if any, of the Applicable Price over 
the Purchase Price (subject to adjustment pursuant to Section 7) paid 
(or, in the case of Option Shares with respect to which the Option 
has been exercised but the Closing Date has not occurred, payable) 
by Grantee for each share of Issuer Common Stock with respect to 
which the Option has been exercised and with respect to which 
Grantee then has beneficial ownership, multiplied by the number of 
such shares.

        (b) If Grantee exercises its rights under this Section 
8, Issuer shall, within 10 business days after the Request Date, pay 
the Section 8 Repurchase Consideration to Grantee in immediately 
available funds, and contemporaneously with such payment Grantee 
shall surrender to Issuer the Option and the certificates evidencing 
the shares of Issuer Common Stock purchased thereunder with 
respect to which Grantee then has beneficial ownership, and Grantee 
shall warrant that it has sole record and beneficial ownership of such 
shares and that the same are then free and clear of all liens, claims, 
charges and encumbrances of any kind whatsoever.  Notwithstanding 
the foregoing, to the extent that prior notification to or approval of 
the Federal Reserve Board or other regulatory authority is required in 
connection with the payment of all or any portion of the Section 8 
Repurchase Consideration, Grantee shall have the ongoing option to 
revoke its request for repurchase pursuant to Section 8, in whole or 
part, or to require that Issuer deliver from time to time that portion of 
the Section 8 Repurchase Consideration that it is not then so 
prohibited from paying and promptly file the required notice or 
application for approval and expeditiously process the same (and 
each party shall cooperate with the other in the filing of any such 

                                     7
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notice or application and the obtaining of any such approval).  If the 
Federal Reserve Board of any other regulatory authority disapproves 
of any part of Issuer's proposed repurchase pursuant to this Section 
8, Issuer shall promptly give notice of such fact to Grantee.  If the 
Federal Reserve Board or other agency prohibits the repurchase in 
part but not in whole, then Grantee shall have the right (i) to revoke 
the repurchase request or (ii) to the extent permitted by the Federal 
Reserve Board or other agency, determine whether the repurchase 
should apply to the Option and/or Option Shares and to what extent 
to each, and Grantee shall thereupon have the right to exercise the 
Option as to the number of Option Shares for which the Option was 
exercisable at the Request Date less the sum of the number of shares 
covered by the Option in respect of which payment has been made 
pursuant to Section 8(a)(ii) and the number of shares covered by the 
portion of the Option (if any) that has been repurchased.  Grantee 
shall notify Issuer of its determination under the preceding sentence 
within five (5) business days of receipt of notice of disapproval of 
the repurchase.


     Notwithstanding anything herein to the contrary, all of 
Grantee's rights under this Section 8 shall terminate on the date of 
termination of this Option pursuant to Section 3(a).

        (c)	For purposes of this Agreement, the "Applicable 
Price" means the highest of (i) the highest price per share of Issuer 
Common Stock paid for any such share by the person or groups 
described in Section 8(d)(i), (ii) the price per share of Issuer 
Common Stock received by holders of Issuer Common Stock in 
connection with any merger or other business combination 
transaction described in Section 7(b)(i), 7(b)(ii), or 7(b)(iii), or (iii) 
the highest closing sales price per share of Issuer Common Stock 
reported on the NASD/SCM (or if transactions in Issuer Common 
Stock are not reported on the NASD/SCM, the highest bid price per 
share as quoted on the principal trading market or securities 
exchange on which such shares are traded as reported by a 
recognized source chosen by Grantee) during the 60 business days 
preceding the Request Date; provided, however, that in the event of a 
sale of less than all of Issuer's assets, the Applicable Price shall be 
the sum of the price paid in such sale for such assets and the current 
market value of the remaining assets of Issuer as determined by a 
nationally recognized investment banking firm selected by Grantee, 
divided by the number of shares of the Issuer Common Stock 
outstanding at the time of such sale.  If the consideration to be 
offered, paid or received pursuant to either of the foregoing clauses 
(i) or (ii) shall be other than in cash, the value of such consideration 
shall be determined in good faith by an independent nationally 
recognized investment banking firm selected by Grantee and 
reasonably acceptable to Issuer, which determination shall be 
conclusive for all purposes of this Agreement.

                                     8
                                     99
<PAGE>

        (d)	As used herein, "Repurchase Event" shall occur 
if (i) any person (other than Grantee or any subsidiary of Grantee) 
shall have acquired beneficial ownership of (as such term is defined 
in Rule 13d-3 promulgated under the Exchange Act), or the right to 
acquire beneficial ownership of, or any "group" (as such term is 
defined under the Exchange Act) shall have been formed which 
beneficially owns or has the right to acquire beneficial ownership of, 
50% or more of the then outstanding shares of Issuer Common 
Stock, or (ii) any of the transactions described in Section 7(b)(i), 
7(b)(ii) or 7(b)(iii) shall be consummated.

        (e)	In connection with the application of the 
provisions of this Section 8, Grantee acknowledges the regulatory 
and capital matters Previously Disclosed by Issuer to Grantee.

     9.	Registration Rights.

        (a)	Demand Registration Rights.  Issuer shall, 
subject to the conditions of subparagraph (c) below, if requested by 
Grantee (or if applicable, a Grantee Majority), as expeditiously as 
possible prepare and file a registration statement under the Securities 
Act if such registration is necessary in order to permit the sale or 
other disposition of any or all shares of Issuer Common Stock or 
other securities that have been acquired by or are issuable to Grantee 
upon exercise of the Option in accordance with the intended method 
of sale or other disposition stated by Grantee in such request, 
including without limitation a "shelf" registration statement under 
Rule 415 under the Securities Act or any successor provision, and 
Issuer shall use its best efforts to qualify such shares or other 
securities for sale under any applicable state securities laws.

        (b)	Additional Registration Rights.  If Issuer at any 
time after the exercise of the Option proposes to register any shares 
of Issuer Common Stock under the Securities Act in connection with 
an underwritten public offering of such Issuer Common Stock, Issuer 
will promptly give written notice to Grantee (and any permitted 
transferee) of its intention to do so and, upon the written request of 
Grantee (or any such permitted transferee of Grantee) given within 
30 days after receipt of any such notice (which request shall specify 
the number of shares of Issuer Common Stock intended to be 
included in such underwritten public offering by Grantee (or such 
permitted transferee)), Issuer will cause all such shares, the holders 
of which shall have requested participation in such registration, to be 
so registered and included in such underwritten public offering, 
provided, however, that Issuer may elect to not cause any such 
shares to be so registered (i) if the underwriters in good faith object 
for valid business reasons, or (ii) in the case of a registration solely 
to implement an employee benefit plan or a registration filed on 
Form S-4; provided, further, however, that such election pursuant to 
(i) may only be made one time.  If some but not all the shares of 

                                       9
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<PAGE>

Issuer Common Stock, with respect to which Issuer shall have 
received requests for registration pursuant to this subparagraph (b), 
shall be excluded from such registration, Issuer shall make 
appropriate allocation of shares to be registered among Grantee and 
any such permitted transferee desiring to register their shares pro rata 
in the proportion that the number of shares requested to be registered 
by each such holder bears to the total number of shares requested to 
be registered by all such holders then desiring to have Issuer 
Common Stock registered for sale.

        (c)	Conditions to Required Registration.  Issuer 
shall use all reasonable efforts to cause each registration statement
referred to in subparagraph (a) above to become effective and to 
obtain all consents or waivers of other parties which are required 
therefor and to keep such registration statement effective, provided, 
however, that Issuer may delay any registration of Option Shares 
required pursuant to subparagraph (a) above for a period not 
exceeding 90 days provided Issuer shall in good faith determine that 
any such registration would adversely affect an offering or 
contemplated offering of other securities by Issuer, and Issuer shall 
not be required to register Option Shares under the Securities Act 
pursuant to subparagraph (a) above:

            (i)	prior to the earliest of (a) termination of 
the Plan pursuant to Article VII thereof, (b) failure to obtain the 
requisite stockholder approval pursuant to Paragraph (A) of Article 
VI of the Plan, and (c) a Purchase Event or a Preliminary Purchase 
Event;

            (ii)	on more than two occasions;

            (iii)	more than once during any calendar year;

            (iv)	within 90 days after the effective date of 
a registration referred to in subparagraph (b) above pursuant to 
which the holder or holders of the Option Shares concerned were 
afforded the opportunity to register such shares under the Securities 
Act and such shares were registered as requested; and

            (v)	unless a request therefor is made to 
Issuer by the holder or holders of at least 25% or more of the 
aggregate number of Option Shares then outstanding.

     In addition to the foregoing, Issuer shall not be required to 
maintain the effectiveness of any registration statement after the 
expiration of nine months from the effective date of such registration 
statement.  Issuer shall use all reasonable efforts to make any filings, 
and take all steps, under all applicable state securities laws to the 
extent necessary to permit the sale or other disposition of the Option 
Shares so registered in accordance with the intended method of 

                                   10
                                   101
<PAGE>

distribution for such shares, provided, however, that Issuer shall not 
be required to consent to general jurisdiction or qualify to do 
business in any state where it is not otherwise required to so consent 
to such jurisdiction or to so qualify to do business.

        (d)	Expenses.  Except where applicable state law 
prohibits such payments, Issuer will pay all expenses (including 
without limitation registration fees, qualification fees, blue sky fees 
and expenses (including the fees and expenses of counsel), legal 
expenses including the reasonable fees and expenses of one counsel 
to the holders whose Option Shares are being registered, printing 
expenses and the costs of special audits or "cold comfort" letters, 
expenses of underwriters, excluding discounts and commissions but 
including liability insurance if Issuer so desires or the underwriters 
so require, and the reasonable fees and expenses of any necessary 
special experts) in connection with each registration pursuant to 
subparagraph (a) or (b) above (including the related offerings and 
sales by holders of Option Shares) and all other qualifications, 
notifications or exemptions pursuant to subparagraph (a) or (b) 
above.

        (e)	Indemnification.  In connection with any 
registration under subparagraph (a) or (b) above Issuer hereby 
indemnifies the holder of the Option Shares, and each underwriter 
thereof, including each person, if any, who controls such holder or 
underwriter within the meaning of Section 15 of the Securities Act, 
against all expenses, losses, claims, damages and liabilities caused 
by any untrue, or alleged untrue, statement of a material fact 
contained in any registration statement or prospectus or notification 
or offering circular (including any amendments or supplements 
thereto) or any preliminary prospectus, or caused by any omission, or 
alleged omission, to state therein a material fact required to be stated 
therein or necessary to make the statements therein not misleading, 
except insofar as such expenses, losses, claims, damages or liabilities 
of such indemnified party are caused by any untrue statement or 
alleged untrue statement that was included by Issuer in any such 
registration statement or prospectus or notification or offering 
circular (including any amendments or supplements thereto) in 
reliance upon and in conformity with, information furnished in 
writing to Issuer by such indemnified party expressly for use therein, 
and Issuer and each officer, director and controlling person of Issuer 
shall be indemnified by such holder of the Option Shares, or by such 
underwriter, as the case may be, for all such expenses, losses, claims, 
damages and liabilities caused by any untrue, or alleged untrue, 
statement, that was included by Issuer in any such registration 
statement or prospectus or notification or offering circular (including 
any amendments or supplements thereto) in reliance upon, and in 
conformity with, information furnished in writing to Issuer by such 
holder or such underwriter, as the case may be, expressly for such 
use.

     Promptly upon receipt by a party indemnified under this 
subparagraph (e) of notice of the commencement of any action 

                                   11
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<PAGE>

against such indemnified party in respect of which indemnity or 
reimbursement may be sought against any indemnifying party under 
this subparagraph (e), such indemnified party shall notify the 
indemnifying party in writing of the commencement of such action, 
but the failure so to notify the indemnifying party shall not relieve it 
of any liability which it may otherwise have to any indemnified party 
under this subparagraph (e).  In case notice of commencement of any 
such action shall be given to the indemnifying party as above 
provided, the indemnifying party shall be entitled to participate in 
and, to the extent it may wish, jointly with any other indemnifying 
party similarly notified, to assume the defense of such action at its 
own expenses with counsel chosen by it and satisfactory to such 
indemnified party.  The indemnified party shall have the right to 
employ separate counsel in any such action and participate in the 
defense thereof, but the fees and expenses of such counsel (other 
than reasonable costs of investigation) shall be paid by the 
indemnified party unless (i) the indemnifying party either agrees to 
pay the same; (ii) the indemnifying party fails to assume the defense 
of such action with counsel satisfactory to the indemnified party, or 
(iii) the indemnified party has been advised by counsel that one or 
more legal defenses may be available to the indemnifying party that 
may be contrary to the interest of the indemnified party, in which 
case the indemnifying party shall be entitled to assume the defense 
of such action notwithstanding its obligation to bear fees and 
expenses of such counsel.  No indemnifying party shall be liable for 
any settlement entered into without its consent, which consent may 
not be unreasonably withheld.

     If the indemnification provided for in this subparagraph (e) is 
unavailable to a party otherwise entitled to be indemnified in respect 
of any expenses, losses, claims, damages or liabilities referred to 
herein, then the indemnifying party, in lieu of indemnifying such 
party otherwise entitled to be indemnified, shall contribute to the 
amount paid or payable by such party to be indemnified as a result of 
such expenses, losses, claims, damages or liabilities in such 
proportion as is appropriate to reflect the relative benefits received 
by Issuer, the selling shareholders and the underwriters from the 
offering of the securities and also the relative fault of Issuer, the 
selling shareholders and the underwriters in connection with the 
statements or omissions which resulted in such expenses, losses, 
claims, damages or liabilities, as well as any other relevant equitable 
considerations.  The amount paid or payable by a party as a result of 
the expenses, losses, claims, damages and liabilities referred to 
above shall be deemed to include any legal or other fees or expenses 
reasonably incurred by such party in connection with investigating or 
defending any action or claim; provided, however, that in no case 
shall the holders of the Option Shares be responsible, in the 
aggregate, for any amount in excess of the net offering proceeds 
attributable to its Option Shares included in the offering.  No person 
guilty of fraudulent misrepresentation (within the meaning of Section 
11(f) of the Securities Act) shall be entitled to contribution from any 
person who was not guilty of such fraudulent misrepresentation.  
Any obligation by any holder to indemnify shall be several and not 
joint with other holders.

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<PAGE>

     In connection with any registration pursuant to subparagraph 
(a) or (b) above, Issuer and each holder of any Option Shares (other 
than Grantee) shall enter into an agreement containing the 
indemnification provisions of this subparagraph (e).

        (f)	Miscellaneous Reporting.  Issuer shall comply 
with all reporting requirements and will do all such other things as 
may be necessary to permit the expeditious sale at any time of any 
Option Shares by the holder thereof in accordance with and to the 
extent permitted by any rule or regulation promulgated by the SEC 
from time to time, including, without limitation, Rule 144A.  Issuer 
shall at its expense provide the holder of any Option Shares with any 
information necessary in connection with the completion and filing 
of any reports or forms required to be filed by them under the 
Securities Act or the Exchange Act, or required pursuant to any state 
securities laws or the rules of any stock exchange.

        (g)	Issue Taxes.  Issuer will pay all stamp taxes in 
connection with the issuance and the sale of the Option Shares and in 
connection with the exercise of the Option, and will save Grantee 
harmless, without limitation as to time, against any and all liabilities, 
with respect to all such taxes.

     10. Quotation; Listing.  If Issuer Common Stock or any 
other securities to be acquired upon exercise of the Option are then 
authorized for quotation or trading or listing on the NASD/SCM, the 
National Association of Securities Dealers Automated Quotation 
System National Market System ("NASDAQ/NMS") or any 
securities exchange, Issuer, upon the request of Grantee, will 
promptly file an application, if required, to authorize for quotation or 
trading or listing the shares or Issuer Common Stock or other 
securities to be acquired upon exercise of the Option on the 
NASD/SCM, NASDQ/NMS or such other securities exchange and 
will use its best efforts to obtain approval, if required, of such 
quotation or listing as soon as practicable.

     11. Division of Option.  This Agreement (and the Option 
granted hereby) are exchangeable, without expense, at the option of 
Grantee, upon presentation and surrender of this Agreement at the 
principal office of Issuer for other Agreements providing for Options 
of different denominations entitling the holder thereof to purchase in 
the aggregate the same number of shares of Issuer Common Stock 
purchasable hereunder.  The terms "Agreement" and "Option" as 
used herein include any other Agreements and related Options for 
which this Agreement (and the Option granted hereby) may be 
exchanged.  Upon receipt by Issuer of evidence reasonably 
satisfactory to it of the loss, theft, destruction or mutilation of this 
Agreement, and (in the case of loss, theft or destruction) of 
reasonably satisfactory indemnification, and upon surrender and
cancellation of this Agreement, if mutilated, Issuer will execute and 
deliver a new Agreement of like tenor and date.  Any such new 

                                    13
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<PAGE>

Agreement executed and delivered shall constitute an additional 
contractual obligation on the part of Issuer, whether or not the 
Agreement so lost, stolen, destroyed or mutilated shall at any time be 
enforceable by anyone.

     12.	Miscellaneous.

        (a)	Expenses.  Except as otherwise provided in 
Section 9, each of the parties hereto shall bear and pay all costs and 
expenses incurred by it or on its behalf in connection with the 
transactions contemplated hereunder, including fees and expenses of 
its own financial consultants, investment bankers, accountants and 
counsel.

        (b)	Waiver and Amendment.  Any provision of this 
Agreement may be waived at any time by the party that is entitled to 
the benefits of such provision.  This Agreement may not be 
modified, amended, altered or supplemented except upon the 
execution and delivery of a written agreement executed by the 
parties hereto.

        (c)	Entire Agreement:  No Third-Party Beneficiary; 
Severability.  This Agreement, together with the Plan and the other 
documents and instruments referred to herein and therein, between 
Grantee and Issuer (a) constitutes the entire agreement and 
supersedes all prior agreements and understandings, both written and
oral, between the parties with respect to the subject matter hereof and 
(b) is not intended to confer upon any person other than the parties 
hereto (other than any transferees of the Option Shares or any 
permitted transferee of this Agreement pursuant to Section 12(h)) 
any rights or remedies hereunder.  If any term, provision, covenant 
or restriction of this Agreement is held by a court of competent 
jurisdiction or a federal or state regulatory agency to be invalid, void 
or unenforceable, the remainder of the terms, provisions, covenants 
and restrictions of this Agreement shall remain in full force and 
effect and shall in no way be affected, impaired or invalidated.  If for 
any reason such court or regulatory agency determines that the 
Option does not permit Grantee to acquire, or does not require Issuer 
to repurchase, the full number of shares of Issuer Common Stock as 
provided in Sections 3 and 8 (as adjusted pursuant to Section 7), it is 
the express intention of Issuer to allow Grantee to acquire or to 
require Issuer to repurchase such lesser number of shares as may be 
permissible without any amendment or modification hereof.

        (d)	Governing Law.  This Agreement shall be governed and construed 
in accordance with the laws of the Commonwealth of Virginia without 
regard to any applicable conflicts of law rules.

                                     14
                                     105
<PAGE>

        (e)	Descriptive Heading.  The descriptive headings contained 
herein are for convenience of reference only and shall not affect in 
any way the meaning or interpretation of this Agreement.

        (f)	Notices.  All notices and other communications hereunder shall 
be in writing and shall be deemed given if delivered personally, telecopied 
(with confirmation) or mailed by registered or certified mail (return 
receipt requested) to the parties at the following addresses (or at 
such other address for a party as shall be specified by like notice):

        			If to Issuer to:

        			Tysons Financial Corporation
			        8200 Greensboro Drive
        			Suite 100
        			McLean, Virginia 22102

        			Attn:  Terrie G. Spiro, President

        			with a copy to:



		
        			If to Grantee to:

        			MainStreet BankGroup Incorporated
        			200 E. Church Street
        			Martinsville, Virginia 24112-5409

        			Attn:  Michael Brenan, Chairman

        			with a copy to:

        			Douglas W. Densmore, Esq.
        			Flippin, Densmore, Morse, Rutherford & Jessee
        			300 First Campbell Square
        			P.O. Box 1200
        			Roanoke, Virginia 24006


                                    15
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<PAGE>

     (g)	Counterparts.  This Agreement and any amendments hereto may 
be executed in two counterparts, each of which shall be considered one 
and the same agreement and shall become effective when both counterparts 
have been signed, it being understood that both parties need not 
sign the same counterpart.

     (h)	Neither this Agreement nor any of the rights, interest or 
obligations hereunder or under the Option shall be assigned by any 
of the parties hereto (whether by operation of law or otherwise) 
without the prior written consent of the other party, except that 
Grantee may assign this Agreement to a wholly owned subsidiary of 
Grantee and Grantee may assign its rights hereunder in whole or in part 
after the occurrence of a Purchase Event.  Subject to the preceding 
sentence, this Agreement shall be binding upon, inure to the benefit of 
and be enforceable by the parties and their respective successors 
and assigns.

     (i)	Further Assurances.  In the event of any exercise of the Option 
by Grantee, Issuer and Grantee shall execute and deliver all other 
documents and instruments and take all other action that may be 
reasonably necessary in order to consummate the transactions provided 
for by such exercise.	

     (j)	Specific Performance.  The parties hereto agree that this 
Agreement may be enforced by either party through specific performance, 
injunctive relief and other equitable relief.  Both parties further 
agree to waive any requirement for the securing or posting of any bond 
in connection with the obtaining of any such equitable relief and 
that this provision is without prejudice to any other rights that 
the parties hereto may have for any failure to perform this Agreement.

   IN WITNESS WHEREOF, Issuer and Grantee have caused this Stock Option 
Agreement to be signed by their respective officers thereunto duly 
authorized, all as of the day and year first written above.

ATTEST:                                    Tysons Financial Corporation    


By:______________                          By:_______________________
                                              Terrie G. Spiro, President
[CORPORATE SEAL]


                                     16
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<PAGE>


ATTEST:                                     MainSteet BankGroup Incorporated


By:_______________                          By:_______________________
                                               Michael Brenan, Chairman
[CORPORATE SEAL]

 
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