Failed to load viewstate. Happening only occasionally. Tough to recreate

Question

Details of Error are given below. This error happens only occasionally / rarely / sometimes and there aren\'t any steps to reproduce it.

How can I know which Control

Answer 1

I've experienced this error, it happens when there is a cross page postback.

For example: You load View A. View A loads fine, for whatever reason the conditions under which View A loaded, no longer exist. The fallback page is View B. So the user completes the form on View A and postsback. Since View A's conditions are no longer met, View A's form values are posted to View B.