return null;

            return _stateState;

        }

        void IStateManager.TrackViewState()

        {

            _marked = true;

            if( _state != null )

                ((IStateManager)_state).TrackViewState();

        }

        void IStateManager.LoadViewState( object state )

        {

            if( state != null )

            {

                object _newState = (object)state;

                 ((IStateManager)ViewState).LoadViewState( _newState );

            }

        }

        bool IStateManager.IsTrackingViewState

        {

            get

            {

                return _marked;

            }

        }

        internal new StateBag ViewState //注意，这里覆盖基类的ViewState属性

        {

            get

            {

                if( _state == null )

                {

                    _state = new StateBag( true );

                    if( ((IStateManager)this).IsTrackingViewState )

                        ((IStateManager)_state).TrackViewState();

                }

                return _state;

            }

        }

        下面把控件的表现输出到页面，其实System.Web.UI.WebControls.TextBox也是重新包装了Input而已。

        protected override void Render(HtmlTextWriter output)

        {

            string strOutput = "<Input name=\""+this.ClientID+"\" type=\"text\" value=\""+this.Text+"\">";

            output.Write(strOutput);

        }

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