The Security Validation for this page is invalid

If we update the Content type in SharePoint ie) customContentType.Update(true); For child updation... It will show the above problem for that I have a solution. that is

SPSecurity.RunWithElevatedPrivileges(delegate()

{

using (SPSite spSite = new SPSite(strUrl, SPContext.Current.Site.SystemAccount.UserToken))

{

spSite.AllowUnsafeUpdates = true;

using (SPWeb spWeb = spSite.OpenWeb())

{

SPWebApplication webApp = spWeb.Site.WebApplication;

webApp.FormDigestSettings.Enabled = false;

spWeb.AllowUnsafeUpdates = true;

// Content Type Updation Code

//CustomContentType.Update(True);

spWeb.AllowUnsafeUpdates = false;

webApp.FormDigestSettings.Enabled = true;

}

spSite.AllowUnsafeUpdates = false;

}

});