ASP.NET 2.0 issues: Validation of viewstate MAC failed

Have you ever experienced such error? Well, today I did. It is not easy to get it - you have to browse too quickly trough pages (or in one page) and click buttons (causing postback). Yep, sounds strange. The point is that if you have a page, with lets say just a text box and a button, and you push that button quickly you will probably get this error - especially if you do it with slow connection or at least not on your local machine.

I would reccommend reading this thread in ASP.NET forums if you want to learn more about this error and want a solution (or a workaround).