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.
1 Answer, 1 is accepted
answered on 26 Sep 2012, 01:25 PM
This exception could be seen in numerous cases. Based on the provided information it is too hard to find the source of issue. Could you share your full page source code along with the code-behind file content? Thus all the people who want to help you will have better understanding of your case.
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