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：

1.新建项目，名字为WebPortal，在项目类型中选择Visual C#项目或者Visual Basic项目都可；

2.在模板类型中选择ASP.NET Web应用程序；

3.位置里输入：http://localhost/WebPortal；

4.添加新项：名字为ShowProgress的Web窗体。

5.在您的Web窗体ShowProgress.aspx上添加任何其他的Web服务器控件。

6.在ShowProgress.aspx上单击右键，点“查看代码”，在最上面输入：

Visual C# .NET代码

using System.Threading;

Visual Basic .NET代码

Imports System.Threading

7.在Page_Load事件里输入： Visual C# .NET代码

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();

Thread.Sleep(10000);

Visual Basic .NET代码

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()

Thread.Sleep(10000)

8.在ShowProgress.aspx窗体的html的中输入：

<script>

HideWait();

</script>

9.点在浏览器中查看即可。