System.Web.UI.Control.SaveViewState C# (CSharp) Method

		protected virtual object SaveViewState ()
		{
			if ((stateMask & VISIBLE_CHANGED) != 0) {
				ViewState ["Visible"] = (stateMask & VISIBLE) != 0;
			} else if (_viewState == null) {
				return null;
			}

			return _viewState.SaveViewState ();
		}