The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again

This error occurred to me when I introduce ElevatedPrivilages block to the project.

SPSecurity.RunWithElevatedPrivileges(delegate()
{…}

I refreshed the page and still I got the error. Then I found that I missed the

web.AllowUnsafeUpdates = true;

in the code.

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