ASP.NET复合控件开发

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace ServerControl1
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:ServerControl1 runat=server></{0}:ServerControl1>")]
    public class ServerControl1 : CompositeControl,INamingContainer
    {
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string Text
        {
            get
            {
                String s = (String)ViewState["Text"];
                return ((s == null) ? "[" + this.ID + "]" : s);
            }

            set
            {
                ViewState["Text"] = value;
            }
        }
        
        public string Tip 
        {
            get { return ViewState["aa"].ToString(); }
            set{ViewState["aa"]=value;}
        }
        TextBox tb1;
        Button btn;
        Label lb;
        protected override void CreateChildControls()
        {
            Controls.Add(new LiteralControl("<h3>第一个数"));
             tb1 = new TextBox();
            tb1.Text = "0";
            Controls.Add(tb1);
             btn = new Button();
            btn.Text = "登录";
            btn.CommandName = "login";
           // btn.Click += new EventHandler(btn_Click);
            Controls.Add(btn);
             lb = new Label();
            lb.Text = "aaaaaaaaa";
            Controls.Add(lb);
        }
//点击复合控件中的子控件的事件时触发，事件冒泡出来

        protected override bool OnBubbleEvent(object source, EventArgs e)

        {
            bool handed = false;
            if (e is CommandEventArgs )
            {
                CommandEventArgs ce = (CommandEventArgs)e;
                if (ce.CommandName=="login")
                {
                    lb.Text = "aaaaaaaa";
                    handed = true;
                }
            }
            return handed;
        }

        public class CheckEventArgs : EventArgs
        {
            private bool match = false;

            public CheckEventArgs(int difference)
            {
                if (difference == 0)
                {
                    match = true;
                }
            }
            public bool Match
            {
                get
                {
                    return match;
                }
            }
        }
        public event CheckEventHandler Check;
        public delegate void CheckEventHandler(object sender, CheckEventArgs ce);
    }
}