How To Create MultiColum Dropdownlist using DropDownExtender Control


<%@ Page Language="C#" AutoEventWireup="true" EnableEventValidation="false" CodeFile="MultiColumnDDL.aspx.cs"
Inherits="MultiColumnDDL" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!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>
<style>
   .invisibleColumn
   {
       display: none;
       width: 0px;
   }
   body
   {
       font-family: Arial;
       font-size: 12px;
   }
</style>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
   <asp:UpdatePanel ID="Update1" runat="server">
       <ContentTemplate>
           <cc1:DropDownExtender ID="DropDownExtender1" DropDownControlID="FriendGridView" TargetControlID="txtFriend"
               runat="server">
           </cc1:DropDownExtender>
           <asp:TextBox ID="txtFriend" runat="server" Width="200px"></asp:TextBox>
           <asp:GridView ID="FriendGridView" runat="server" Width="200px" AutoGenerateColumns="false"
               OnRowDataBound="FriendGridView_RowDataBound" OnSelectedIndexChanged="FriendGridView_SelectedIndexChanged">
               <RowStyle BackColor="#DDDDDD" />
               <Columns>
                   <asp:BoundField DataField="ID" HeaderStyle-CssClass="invisibleColumn" ItemStyle-CssClass="invisibleColumn" />
                   <asp:BoundField DataField="Name" HeaderText="Name" />
                   <asp:BoundField DataField="Description" HeaderText="Description" />
               </Columns>
               <HeaderStyle BackColor="Blue" ForeColor="White" />
               <AlternatingRowStyle BackColor="#EEEEEE" />
               <SelectedRowStyle BackColor="#999999" />
           </asp:GridView>
       </ContentTemplate>
   </asp:UpdatePanel>
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class MultiColumnDDL : System.Web.UI.Page
{
 protected void Page_Load(object sender, EventArgs e)
 {
     if (!IsPostBack)
     {
         FriendGridView.DataSource = GetFriends();
         FriendGridView.DataBind();
     }

 }
 protected void FriendGridView_RowDataBound(object sender, GridViewRowEventArgs e)
 {
     if (e.Row.RowType != DataControlRowType.DataRow)
         return;

     e.Row.Attributes["onmouseover"] = "this.style.cursor='hand';"
     + "this.originalBackgroundColor=this.style.backgroundColor;"
     + "this.style.backgroundColor='#bbbbbb';";

     e.Row.Attributes["onmouseout"] =
     "this.style.backgroundColor=this.originalBackgroundColor;";

     e.Row.Attributes["onclick"] =
     ClientScript.GetPostBackClientHyperlink(this.FriendGridView,
      "Select$" + e.Row.RowIndex);
 }
 public List<Friend> GetFriends()
 {

     List<Friend> users = new List<Friend>();
     users.Add(new Friend("Xyz", "Coder"));
     users.Add(new Friend("Abc", "Writer"));
     users.Add(new Friend("Charles", "Poet"));
     return users;


 }
 protected void FriendGridView_SelectedIndexChanged(object sender, EventArgs e)
 {
     // assign firstname
     if (FriendGridView.SelectedRow != null)
         txtFriend.Text = Server.HtmlDecode(
           FriendGridView.SelectedRow.Cells[1].Text);
     else
         txtFriend.Text = "";

 }
}
public class Friend
{

 public Friend(string name, string description)
 {

     _name = name;

     _description = description;

     _id = Guid.NewGuid().ToString();

 }



 private string _id;
 public string Id
 {

     get { return _id; }

     set { _id = value; }

 }

 private string _name;
 public string Name
 {

     get { return _name; }

     set { _name = value; }

 }
 private string _description;
 public string Description
 {

     get { return _description; }

     set { _description = value; }

 }
}

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