Invalid postback or callback argument. Event validation is enabled using ''

Question

I am getting the following error when I post back a page from the client-side. I have JavaScript code that modifies an asp:ListBox on the client side.

How do we fix

Answer 1

3: I changed my button type in grid column from "PushButton" to "LinkButton". It worked! ("ButtonType="LinkButton") I think if you can change your button to other controls like "LinkButton" in other cases, it would work properly.

I wish I could vote you up, Amir (alas my rep is too low.) I was just having this problem and changing this worked like a champ on my gridview. Just a little aside, I think the valid code is: ButtonType="Link"

I suspect this is because when you click 'edit', your edit changes to 'update' and 'cancel' which then change back to 'edit' on submit. And these shifting controls make .net uneasy.