动态添加web控件

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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace DynamicCreateControl
{
    /// <summary>
    /// WebForm1 的摘要说明。
    /// </summary>
    public class WebForm1 : System.Web.UI.Page
    {
         protected System.Web.UI.WebControls.Button Button1;
        protected System.Web.UI.WebControls.Button Button2;
        protected System.Web.UI.WebControls.Label Label1;
        protected System.Web.UI.WebControls.PlaceHolder PlaceHolder1;
        private TextBox textBox = new TextBox();
        private void Page_Load(object sender, System.EventArgs e)
      {
      // 在此处放置用户代码以初始化页面
    }

      #region Web 窗体设计器生成的代码
     override protected void OnInit(EventArgs e)
      {
          //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
          //
           InitializeComponent();
           base.OnInit(e);
     }

      /// <summary>
      /// 设计器支持所需的方法 - 不要使用代码编辑器修改
      /// 此方法的内容。
     /// </summary>
     private void InitializeComponent()
     {
         his.Button1.Click += new System.EventHandler(this.Button1_Click);
         this.Button2.Click += new System.EventHandler(this.Button2_Click);
         this.Load += new System.EventHandler(this.Page_Load);
   }
    #endregion

     private void Button1_Click(object sender, System.EventArgs e)
     {
          textBox.Text = "00001";
          textBox.ID = "txtBox";
           this.PlaceHolder1.Controls.Add( textBox );//

将 PlaceHolder 控件用作存储动态添加到网页的服务器控件的容器。PlaceHolder 控件不产生任何可见输出并且只能用作网页上其他控件的容器。可以使用 Control.Controls 集合添加、插入或移除 PlaceHolder 控件中的控件。//

}

      private void Button2_Click(object sender, System.EventArgs e)
      {

         this.Label1.Text =Request["txtBox"];
     }
   }
}

2、

<%@ Page Language="C#" AutoEventWireup="True" %>

<html>
<head>

   <script runat="server">

      void Page_Load(Object sender, EventArgs e)
      {
         HtmlButton myButton = new HtmlButton();

         myButton.InnerText = "Button 1";
         PlaceHolder1.Controls.Add(myButton);

         myButton = new HtmlButton();
         myButton.InnerText = "Button 2";
         PlaceHolder1.Controls.Add(myButton);

         myButton = new HtmlButton();
         myButton.InnerText = "Button 3";
         PlaceHolder1.Controls.Add(myButton);

         myButton = new HtmlButton();
         myButton.InnerText = "Button 4";
         PlaceHolder1.Controls.Add(myButton);
      }

   </script>

</head>

<body>
   <form runat="server">
      <h3>PlaceHolder Example</h3>

      <asp:PlaceHolder id="PlaceHolder1"
           runat="server"/>
   </form>
</body>
</html>

完