Error: Invalid postback or callback argument

Question

I am getting the following error on a button click with gridview

 Server Error in \'/\' Application.
Invalid postback or callback argument.  Event validation         


        

Answer 1

A few things to try

1. In your Page Load event, add a check for !Page.IsPostBack and move the non-authenticating code block there.
2. Experiment using a LinkButton instead of a regular button.