.NET中实现无客户端联动菜单(无刷新)[转]

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<%@ Page language="c#" Codebehind="WebForm1.aspx.cs"
            AutoEventWireup="false" Inherits="CustomManager.company.WebForm1" %>
            <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
            <HTML>
            <HEAD>
            <title>WebForm1</title>
            <meta content="Microsoft Visual Studio .NET 7.1" >
            <meta content="C#" >
            <meta content="javascript" >
            <meta content="http://schemas.microsoft.com/intellisense/ie5"
            >
            <LINK href="../css/style.css" type="text/css" rel="stylesheet">
            </HEAD>
            <body MS_POSITIONING="GridLayout">
            <form method="post" runat="server">
            <asp:dropdownlist style="Z-INDEX: 101; LEFT:
            40px; ; TOP: 168px"
            runat="server"></asp:dropdownlist><asp:label
            style="Z-INDEX: 102; LEFT: 328px; ; TOP: 104px"
            runat="server">Label</asp:label>
            <asp:DropDownList style="Z-INDEX: 104; LEFT:
            40px; ; TOP: 264px"
            runat="server"></asp:DropDownList></form>
            <script LANGUAGE="javascript">
            var str = document.getElementById("Label1").innerText;
            arr=str.split(",");
            a=arr.length
            ar=new Array()
            for (i=0;i<a;i++){
            ar[i]=arr[i].split("-");
            }
            onecount=ar.length;

            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;
            namespace CustomManager.company
            {
            /// <summary>
            /// WebForm1 的摘要说明。
            /// </summary>
            public class WebForm1 : System.Web.UI.Page
            {
            protected System.Web.UI.WebControls.DropDownList DropDownList1;
            protected System.Web.UI.WebControls.Label Label1;
            protected System.Web.UI.WebControls.DropDownList DropDownList2;
            static protected DataTable tb1;

            private void Page_Load(object sender, System.EventArgs e)
            {
            // 在此处放置用户代码以初始化页面
            if(!Page.IsPostBack)
            {

            }
            DropDownList1.Attributes.Add("onchange","ld();");
            string strConn,strSql;
            System.Data.SqlClient.SqlDataAdapter da;

            strConn = "server=localhost;database=custom;uid=custom;pwd=a;";
            strSql = "select * from custom.bigcalling;";
            da = new System.Data.SqlClient.SqlDataAdapter(strSql,strConn);
            DataTable tb3 = new DataTable();
            da.Fill(tb3);
            DropDownList1.DataSource = tb3;
            DropDownList1.DataTextField = "BIGCALLNAME";
            DropDownList1.DataValueField= "BIGCALLID";
            DropDownList1.DataBind();

            strSql = "select * from custom.smallcalling;";
            da = new System.Data.SqlClient.SqlDataAdapter(strSql,strConn);
            tb1 = new DataTable();
            da.Fill(tb1);

            Label1.Text = "";
            foreach(DataRow row in tb1.Rows)
            {
            Label1.Text = Label1.Text + row["BIGCALLID"] + "-"
            +row["SMALLCALLID"] + "-"+row["SMALLCALLNAME"] + ",";
            }
            }
            #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

}
}