//用委托的方法实现//控件代码        public delegate void DelegateFunction( string sPageTitle );        private DelegateFunction delegateChangePageTitle = null;        public DelegateFunction ChangePT        {            get { return delegateChangePageTitle; }set { delegateChangePageTitle = value; }        }        protected void BtEdit_Click( object sender, EventArgs e )        {            if ( delegateChangePageTitle != null ) delegateChangePageTitle( "Edit" );        }        protected void BtAdd_Click( object sender, EventArgs e )        {            if ( delegateChangePageTitle != null ) delegateChangePageTitle( "Add" );        }//页面    后台代码        protected void Page_Load( object sender, EventArgs e )        {            myWebControl11.ChangePT = ChangePT;        }        void ChangePT( string sTmp )        {            this.Page.Title = sTmp;        }//页面    前代码<%@ Register src=http://www.mamicode.com/"myWebControl.ascx" tagname="myWebControl1" tagprefix="uc1" %><uc1:myWebControl1 ID="myWebControl11" runat="server" />//用事件的方法实现  控件定义事件    页面实现//控件代码//定义一个不含数据的事件处理方法                public event EventHandler ClickModifyTitle;         protected void btCreateValue_Click( object sender, EventArgs e )        {            ClickModifyTitle( this, EventArgs.Empty );         }//页面后台代码        protected void Page_Load( object sender, EventArgs e )        {            myWebControl11.ClickModifyTitle +=new EventHandler(myWebControl11_ClickModifyTitle);        }        void myWebControl11_ClickModifyTitle( object sender, EventArgs e )        {            this.Page.Title += new Random().Next( 1000, 9999 ).ToString();        }