前台代码：

 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="iframe_dropdown.aspx.cs" Inherits="Admin_iframe_dropdown" %>

 <!DOCTYPE html>

 <html xmlns="http://www.w3.org/1999/xhtml">

 <head runat="server">

     <title></title>

 </head>

 <body>

     <form id="form1" runat="server">

      <asp:ScriptManager ID="ScriptManager1" runat="server" />

         <div style="float: left" >

             <asp:UpdatePanel ID="UpdatePanel1" runat="server">

                 <ContentTemplate>

                     <asp:DropDownList ID="DropDownList1" runat="server" Width="105px" AutoPostBack="true"

                         OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" >

                     </asp:DropDownList>

                     <asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="true" Width="105px"

                         OnSelectedIndexChanged="DropDownList2_SelectedIndexChanged">

                     </asp:DropDownList>

                     <asp:DropDownList ID="DropDownList3" runat="server" AutoPostBack="true" Width="105px"

                         OnSelectedIndexChanged="DropDownList3_SelectedIndexChanged">

                     </asp:DropDownList>

                     <asp:DropDownList ID="DropDownList4" runat="server" AutoPostBack="true" Width="105px"

                         OnSelectedIndexChanged="DropDownList4_SelectedIndexChanged">

                     </asp:DropDownList>

                 </ContentTemplate>

             </asp:UpdatePanel>

         </div>

         <div style="float: left" >

              </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;

 using System.Data;

 using System.Data.SqlClient;

 using System.Collections;

 using System.Text;

 public partial class Admin_iframe_dropdown : System.Web.UI.Page

 {

     protected void Page_Load(object sender, EventArgs e)

     {

         if (!IsPostBack)

         {

             Db1DataBind();

             Db2DataBind();

             Db3DataBind();

             Db4DataBind();

         }

     }

     protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

     {

         Db2DataBind();

         Db3DataBind();

         Db4DataBind();

     }

     protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)

     {

         Db3DataBind();

         Db4DataBind();

     }

     protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)

     {

         Db4DataBind();

     }

     protected void DropDownList4_SelectedIndexChanged(object sender, EventArgs e)

     {

     }

     public void Db1DataBind()

     {

         string sqlStr = "select ModID,ModName,ParentID from Modules where ParentID=0000";

         FillDropList(sqlStr, DropDownList1);

     }

     public void Db2DataBind()

     {

         int PreID = Convert.ToInt32(DropDownList1.SelectedValue);

         string sqlStr1 = "Select ModID,ModName,ParentID from Modules where ParentID='" + PreID.ToString() + "'";

         FillDropList(sqlStr1, DropDownList2);

     }

     public void Db3DataBind()

     {

         int PreID = Convert.ToInt32(DropDownList2.SelectedValue);

         string sqlStr2 = "Select ModID,ModName,ParentID from Modules where ParentID='" + PreID.ToString() + "'";

         FillDropList(sqlStr2, DropDownList3);

     }

     public void Db4DataBind()

     {

         string PreID = Convert.ToString(DropDownList3.SelectedValue);

         string sqlStr3 = "Select ModID,ModName,ParentID from Modules where ParentID='" + PreID.ToString() + "'";

         FillDropList(sqlStr3, DropDownList4);

     }

     public void FillDropList(string SQLString, DropDownList drp)

     {

         SqlConnection connection = new SqlConnection("database=ZJExpress;server=(local);uid=sa;pwd=hellocheng");

         SqlCommand cmd = new SqlCommand(SQLString, connection);

         SqlDataAdapter sda = new SqlDataAdapter(cmd);

         DataSet ds = new DataSet();

         sda.Fill(ds, "DropList");

         drp.DataSource = ds.Tables["DropList"].DefaultView;

         drp.DataTextField = ds.Tables["DropList"].Columns[].ColumnName;

         drp.DataValueField = ds.Tables["DropList"].Columns[].ColumnName;

         drp.DataBind();

     }

 }

参考链接http://blog.csdn.net/wxd_860825/article/details/4563368

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