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I have read every article available over the internet,but no result ,still the bug appears.I'm sure the solution is going to be very silly.I have a gridview inside an updatepanel,While sorting or paging I don't get the error,I only get it when I click on an Imagebutton or Linkbutton(Delete,Update):
Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
Updated 2-Jan-12 21:44pm

1 solution


Add PostBackTrigger for you updatePanel. check this link for PostBackTrigger.

This way when you click on your imageButton it will internally postback and this problem will disappear.

hope this solution work for you,

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