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.</title>
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What does this mean? I have a paypal donation button that is causing this when clicked on my aspx page...
Ok.. I put enableeventvalidation ="false" into the page directive, and that stopped the error being thrown. Now the page, when you click the button just refreshes itself ...
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