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首页编程设计正文
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;
 using  System.Threading; 

 namespace  Exercise
 {
    /// <summary>
    /// WebForm2 的摘要说明。
    /// </summary>
    public class WebForm2 : System.Web.UI.Page
    {
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 对于长时间装载的ASP.NET页面如何在客户端浏览器中显示进度？
            //对于加载时间比较长的ASP.NET页面，
            //我们可以在客户端浏览器中显示进度条来显示页面正在装载。下面就是具体的实现过程：
            if(!IsPostBack)
            {
                Response.Write("<div id='mydiv' >");
                Response.Write("_");
                Response.Write("</div>");
                Response.Write("<script>mydiv.innerText = '';</script>");
                Response.Write("<script language=javascript>;");
                Response.Write("var dots = 0;var dotmax = 10;function ShowWait()");
                Response.Write("{var output; output = '正在装载页面';dots++;if(dots>=dotmax)dots=1;");
                Response.Write("for(var x = 0;x < dots;x++){output += '·';}mydiv.innerText =  output;}");
                Response.Write("function StartShowWait(){mydiv.style.visibility = 'visible'; ");
                Response.Write("window.setInterval('ShowWait()',1000);}");
                Response.Write("function HideWait(){mydiv.style.visibility = 'hidden';");
                Response.Write("window.clearInterval();}");
                Response.Write("StartShowWait();</script>");                
                Response.Flush();
                for(long i=0;i<99999999999;i++) i=i++;
                //or Thread.Sleep(10000);
            }

        }

        #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()
        {    
            this.Load += new System.EventHandler(this.Page_Load);
        }
        #endregion
    }
}
<% @ Page language="c#" Codebehind="WebForm2.aspx.cs" AutoEventWireup="false" Inherits="Exercise.WebForm2"  %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"  >
< HTML >
     < HEAD >
         < title > WebForm2 </ title >
         < meta  name ="GENERATOR"  Content ="Microsoft Visual Studio .NET 7.1" >
         < meta  name ="CODE_LANGUAGE"  Content ="C#" >
         < meta  name ="vs_defaultClientScript"  content ="JavaScript" >
         < meta  name ="vs_targetSchema"  content ="http://schemas.microsoft.com/intellisense/ie5" >
         < script  language ="javascript" >
        HideWait();
         </ script >
     </ HEAD >
     < body  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  method ="post"  runat ="server" >
             &nbsp;
         </ form >
     </ body >
</ HTML >

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