Invalid postback or callback argument

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Javascript

ASP.NET4

Hi
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):
Error:

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.