防止在服务器处理完成之前用户多次点击提交按钮
1、在webform3.aspx中代码如下：
<%@ Page Language="c#" Codebehind="WebForm3.aspx.cs" 
AutoEventWireup="false" Inherits="WebApplication1.WebForm3" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><html><head> <title>WebForm3</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 type="text/jscript" language="javascript"> 
function abc() 
{ 
var mybutton=document.getElementById("Button1"); mybutton.disabled=true; //变灰 __doPostBack("Button1",""); //执行服务器端button1的click事件 
} </script></head><body ms_positioning="GridLayout"> <form id="Form1" method="post" runat="server"> <asp:TextBox ID="TextBox1" Style="z-index: 101; left: 8px; position: absolute; top: 8px" runat="server"></asp:TextBox> <asp:Button ID="Button1" Style="z-index: 102; left: 8px; position: absolute; top: 40px" runat="server" Text="Button"></asp:Button> </form></body></html>
2、在webform3.aspx.cs中主要两个方法中的代码如下：
private void Page_Load(object sender, System.EventArgs e) { /*这句很关键，有这句才能让客户端执行服务器端事件。 VS2003环境可以不写 */ this.GetPostBackEventReference(Button1); Button1.Attributes.Add("onclick","abc();"); }
