I got this error while working with SharePoint 2010
. Below is the full error details:
The security validation for this page has timed out. Click Back in your Web browser, refresh the page, and try your operation again.
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: Microsoft.SharePoint.WebPartPages.WebPartPageUserException: The security validation for this page has timed out. Click Back in your Web browser, refresh the page, and try your operation again.
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
I tried the below solution and it works for me:
First open the SharePoint 2010
central administration and then from the Application Management section, Click on Manage web applications. This will open the Web applications list page.
Select the particular web application and click on General Settings from the Ribbon.
This will open the Web Applications General Settings dialog box.
From there Web page Security Validations property, Change the Security validations expires which is by default 30 minutes to Never as shown in the figure below:
Hope this will work.