一提到如何在前台JS调用后台C#方法，AJAX成为了必然的想法。
只是实现的细节采用AJAX 1.0或者AjaxPro的区别。
其实如果不用AJAX，我们也能够很方便地利用JS调用后台方法。
步骤如下：
1 前台放一个按钮。设置为隐藏。注意：不能直接设置Visible=false的方式，这样的话在ASP.Net 2.0编译后的代码里是找不到这个按钮的。需要设置风格：style="display:none;"
2 双击按钮，写入C#方法，或者写一个调用后台其他方法的代码段
3 前台JS调用的时候，照如下写，这样可以模拟按钮的点击事件，触发后台方法：
document.getElementById("Button2").click();
示例
ASP.Net页：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<script>
function go()
{
document.getElementById("Button2").click();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="go();return false;" />
<asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_Click" Style="display: none;" />
</div>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<script>
function go()
{
document.getElementById("Button2").click();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="go();return false;" />
<asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_Click" Style="display: none;" />
</div>
</form>
</body>
</html>
后台C#：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button2_Click(object sender, EventArgs e)
{
this.SayHello();
}
private void SayHello()
{
this.TextBox1.Text = "你好,何奎！";
}
}
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button2_Click(object sender, EventArgs e)
{
this.SayHello();
}
private void SayHello()
{
this.TextBox1.Text = "你好,何奎！";
}
}
呵呵，自我感觉还不错，贴出来希望对大家有点帮助！
摘自：http://www.cnblogs.com/heekui/archive/2007/04/01/695636.html