void RestorePageState ()
{
if (IsPostBack || IsCallback) {
if (_requestValueCollection != null)
scriptManager.RestoreEventValidationState (
_requestValueCollection [ClientScriptManager.EventStateFieldName]);
Trace.Write ("aspx.page", "Begin LoadViewState");
LoadPageViewState ();
Trace.Write ("aspx.page", "End LoadViewState");
}
}