The security validation for this page has timed out. Click back in your Web browser, refresh the page, and try your operation again

The security validation for this page has timed out. Click back in your Web browser, refresh the page, and try your operation again

Error: The security validation for this page has timed out. Click back in your Web browser, refresh the page, and try your operation again." error message when a user submits data to Windows SharePoint Services

the security validation for this page has timed out. Click back in your Web browser, refresh the page, and try your operation again.

If you are facing this error message then Microsoft has already published an article on this which is very useful and resolves your issues.
 

       Reference MS Article: http://support.microsoft.com/kb/888828

Please Comment if you need Any Help or Struck in between. I Am Happy to Help !!!!!