Dear Expert,
I had a problem today on my ASP.NET App (I am using ASP.NET 2.0)

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.

I don't know what does it mean? what should I do? ..

please help, many thanks in advance

Regards
Winanjaya