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View Thread: Invalid postback or callback argument. Wants event validation enabled.
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    qwert231 said:
    I had a Me.DataBind in the Page Load, and it wasn't nested in the If Not Page.IsPostBack, so every time the page was called or did a Postback, everything was DataBound.

    This post:

    showed me that in .Net 2.0 that changes the names of controls embedded in DataGrids/Lists on DataBind. Thus it was an unknown control as far as the code was concerned.

    Thanks man!

    I had exactly the same issue!

    That was so frustrating finding that the problem was this stupid if(!IsPostBack) I believe you had the same pain....