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viewstate to detect form change? - ASP.NET General

Is it possible use viewstate to detect if a form's data has changed? I want to prevent duplicate submission of data. Example: On_click event of Submit button: 1. Save viewstate to session. 2. Insert form data into SQL db. 3. Now suppose the user submits the same form (no changes to data). If I compare the current viewstate to the original viewstate (stored in session), will they be equal ? How can I examine the viewstate during the on_click event? Thanks......

  1. #1

    Default viewstate to detect form change?

    Is it possible use viewstate to detect if a form's data has changed? I
    want to prevent duplicate submission of data.

    Example:

    On_click event of Submit button:

    1. Save viewstate to session.
    2. Insert form data into SQL db.
    3. Now suppose the user submits the same form (no changes to data). If
    I compare the current viewstate to the original viewstate (stored in
    session), will they be equal ?

    How can I examine the viewstate during the on_click event?

    Thanks...
    J. Guest

  2. #2

    Default Re: viewstate to detect form change?

    hI,

    Intersting ....

    you can get the data from form __viewstate field :

    string CurViewState = Request.Form("__viewstate ");

    Natty Gur, CTO
    Dao2Com Ltd.
    34th Elkalay st. Raanana
    Israel , 43000
    Phone Numbers:
    Office: +972-(0)9-7740261
    Fax: +972-(0)9-7740261
    Mobile: +972-(0)58-888377


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    Natty Guest

  3. #3

    Default Re: viewstate to detect form change?

    In a secound thoght the viewstate holds the state of controls on the
    client. i think you need to save the form data and not the viewstate.

    string FormData = this.Request.Form.ToString();

    Natty Gur, CTO
    Dao2Com Ltd.
    34th Elkalay st. Raanana
    Israel , 43000
    Phone Numbers:
    Office: +972-(0)9-7740261
    Fax: +972-(0)9-7740261
    Mobile: +972-(0)58-888377


    *** Sent via Developersdex http://www.developersdex.com ***
    Don't just participate in USENET...get rewarded for it!
    Natty Guest

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