Invalid postback or callback argument.
I came across the post on Forums ie:
Invalid postback or callback argument. Event validation is enabled using 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
To Solve this issue Make sure that you are using IsPostback on the Page_Load() event of that page.
page_Load() eventIf (!IsPostBack){// bind the data}
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