Ajax - "exception has been thrown by the target of an invocation"

Discussion in 'ASP .Net' started by Monty, Aug 18, 2007.

  1. Monty

    Monty Guest

    [ASP.Net 2005, WinXP SP2, IE7]

    I have a GridView in an update panel, and the GridView has an
    ObjectDataSource. Under certain conditions the Object that is the
    ObjectDataSource will throw an exception with a specific error message, but
    on the client side the only error message displayed is "exception has been
    thrown by the target of an invocation". I would like the error message on
    the client to show the error description the object provides when it throws
    the error. Is there any way to do this? For clarification, I know exactly
    why the exception is being thrown, and it should be thrown, so I'm not
    trying to debug that, I'm just trying to figure out how to get the error
    message alert box shown on the client side to show the actual InnerException
    message instead of "exception has been thrown by the target of an
    invocation". TIA
    Monty, Aug 18, 2007
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  2. Hi Monty,

    You can handle the event "AsyncPostBackError" of the ScriptManager instance
    on the WebForm to return a custom message whatever you want:

    protected void ScriptManager1_AsyncPostBackError(object sender,
    AsyncPostBackErrorEventArgs e)
    if (e.Exception != null && e.Exception.InnerException != null)
    ScriptManager1.AsyncPostBackErrorMessage =

    Above code will correctly show the real exception's message.

    Hope this helps.

    Walter Wang (, remove 'online.')
    Microsoft Online Community Support

    When responding to posts, please "Reply to Group" via your newsreader so
    that others may learn and benefit from your issue.

    This posting is provided "AS IS" with no warranties, and confers no rights.
    Walter Wang [MSFT], Aug 20, 2007
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  3. Monty

    Monty Guest

    Perfect, thanks again Walter!
    Monty, Aug 21, 2007
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