protected virtual void SavePageStateToPersistenceMedium (object viewState)
{
PageStatePersister persister = this.PageStatePersister;
if (persister == null)
return;
Pair pair = viewState as Pair;
if (pair != null) {
persister.ViewState = pair.First;
persister.ControlState = pair.Second;
} else
persister.ViewState = viewState;
persister.Save ();
}