getting error when click on the Image button? <p>in my application i have vidoes there with image when i click on any video it is showing this message.</p> <p>Invalid postback or callback argument. Event validation is enabled using in configuration or &lt;%@ 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. </p> <p>i place the enbaleEven validation="true" both in webconfig in that particular page. even though it is giving same error </p>