如何在jquery的组件中触发后台代码，代码如下。求救！！！！啊！！！！

页面代码<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="development_bundle_demos_dialog_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <link type="text/css" href="../../themes/base/jquery.ui.all.css" rel="stylesheet" />    <script type="text/javascript" src="../../jquery-1.4.2.js"></script>    <script type="text/javascript" src="../../external/jquery.bgiframe-2.1.1.js"></script>    <script type="text/javascript" src="../../ui/jquery.ui.core.js"></script>    <script type="text/javascript" src="../../ui/jquery.ui.widget.js"></script>    <script type="text/javascript" src="../../ui/jquery.ui.mouse.js"></script>    <script type="text/javascript" src="../../ui/jquery.ui.draggable.js"></script>    <script type="text/javascript" src="../../ui/jquery.ui.position.js"></script>    <script type="text/javascript" src="../../ui/jquery.ui.resizable.js"></script>    <script type="text/javascript" src="../../ui/jquery.ui.dialog.js"></script>    <script type="text/javascript" src="../../ui/jquery.effects.core.js"></script>    <script type="text/javascript" src="../../ui/jquery.effects.blind.js"></script>    <script type="text/javascript" src="../../ui/jquery.effects.explode.js"></script>    <link type="text/css" href="../demos.css" rel="stylesheet" />    <script type="text/javascript">
        // increase the default animation speed to exaggerate the effect
        $.fx.speeds._default = 1000;
        $(function() {
            $('#dialog').dialog({
                autoOpen: false,
                show: 'blind',
                hide: 'explode'
            });            $('#opener').click(function() {
                $('#dialog').dialog('open');
                return false;
            });
        });
</script></head>
<body>
    <form id="form1" runat="server">
    <div class="demo">
        <div id="dialog" title="Basic dialog">
            <asp:Button ID="Button1" runat="server" Text="加油！" onclick="Button1_Click" />  
        </div>
        <button id="opener">
            Open Dialog</button>
    </div>
    </form>
</body>
</html>－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
后台代码using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;public partial class development_bundle_demos_dialog_Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('密码有误!');</script>");
    }
}