对于多个事件采用事件委托列表的方法比重复写委托，效率更高，占用内存更少

 [DefaultEvent("dbClick")]
    [ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
    //继承了IPostBackEventHandler接口，该接口只有一个方法RaisePostBackEvent(触发Post事件)
    public class WebCustomControl1 : WebControl,IPostBackEventHandler
    {
        //创建一个事件对象，向事件委托列表中添加
        private static readonly object Eventclick = new object();
        private static readonly object Eventclick2 = new object();
        //向委托列表添加事件委托，列表类似hashtable成对键值
        [Description("事件属性结构"), Category("Action")]
        public event EventHandler ccClick
        {
            add
            { Events.AddHandler(Eventclick, value); }
            remove
            { Events.RemoveHandler(Eventclick, value); }
        }
        [Description("事件属性结构"), Category("Action")]
        public event EventHandler ddClick
        {
            add
            { Events.AddHandler(Eventclick2, value); }
            remove
            { Events.RemoveHandler(Eventclick2, value); }
        }
        //事件处理过程(事件内容)
        protected virtual void dbClick(EventArgs e)
        {
            //从列表中取出委托，由于装箱的时候是object，所以拆箱的时候要转换类型
            EventHandler clickHandler = (EventHandler)Events[Eventclick];
            if (clickHandler != null)
            {
                clickHandler(this, e);
            }
        }
        //事件处理过程(事件内容)
        protected virtual void dbClick2(EventArgs e)
        {
            //从列表中取出委托，由于装箱的时候是object，所以拆箱的时候要转换类型
            EventHandler clickHandler = (EventHandler)Events[Eventclick2];
            if (clickHandler != null)
            {
                clickHandler(this, e);
            }
        }
        public void RaisePostBackEvent(string eventArgument)
        {
            dbClick(EventArgs.Empty);
            dbClick2(EventArgs.Empty);
        }protected override void RenderContents(HtmlTextWriter output)
        {
            output.Write("<input type=submit name="+this.UniqueID+" value=click me!/>");
        }

    }