How To Use Radio Button List as DropDownList in ASP.NET

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

<%@ Register TagPrefix="ajaxToolkit" Assembly="AjaxControlToolkit"  
Namespace="AjaxControlToolkit" %>  
<!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>Untitled Page</title>  
</head>  
<style type="text/css">  
  .popupControl  
  {  
      background-color:White;  
      position:absolute;  
      visibility:hidden;  
  }  
</style>  
<body>  
<form id="form1" runat="server">  
  <asp:ScriptManager ID="ScriptManager1" runat="server">  
  </asp:ScriptManager>  
  <asp:DetailsView ID="dvProduct" runat="server" DefaultMode="Edit"  
AutoGenerateRows="false"  
      Width="100%" HeaderText="Products">  
      <HeaderStyle BackColor="AliceBlue" Font-Bold="true" />  
      <FieldHeaderStyle BackColor="aliceBlue" Width="150px" Font-Bold="true" />  
      <RowStyle Height="20px" />  
      <Fields>  
          <asp:BoundField HeaderText="Column1" DataField="Column1" />  
          <asp:BoundField HeaderText="Column2" DataField="Column2" />  
          <asp:TemplateField HeaderText="Category">  
              <ItemTemplate>  
                  <asp:TextBox ID="txtCategory" runat="server" Text='<%# Eval("Column2") %>' />  
                  <asp:Panel ID="pnlCategories" runat="server" CssClass="popupControl">  
                      <div style="border: 1px outset white; width: 275px">  
                          <asp:UpdatePanel ID="Update1" runat="server">  
                              <ContentTemplate>  
                                  <div>  
                                      <asp:RadioButtonList ID="rdoButton" runat="server"  
DataSource='<%#GetCustomMadeDataTable()%>'  
                                          DataTextField="Column1" DataValueField="Id"  
AutoPostBack="True"  
SelectedValue='<%# Bind("Id") %>'  
                                          OnSelectedIndexChanged="rdoButton_SelectedIndexChanged">  
                                      </asp:RadioButtonList>  
                                  </div>  
                              </ContentTemplate>  
                          </asp:UpdatePanel>  
                      </div>  
                      <ajaxToolkit:PopupControlExtender ID="popupControl" runat="server"  
TargetControlID="txtCategory"  
                          PopupControlID="pnlCategories" CommitProperty="value" Position="Top">  
                      </ajaxToolkit:PopupControlExtender>  
                  </asp:Panel>  
              </ItemTemplate>  
          </asp:TemplateField>  
      </Fields>  
  </asp:DetailsView>  
</form>  
</body>  
</html>  
using System;  
using System.Data;  
using System.Configuration;  
using System.Collections;  
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 AjaxControlToolkit;  

public partial class PopUpRadioList : System.Web.UI.Page  
{  
protected void Page_Load(object sender, EventArgs e)  
{  
  if (!IsPostBack)  
  {  

      if (Session["strTemp"] != null)  
      {  

          dvProduct.DataSource = Session["strTemp"] as DataTable;  

          dvProduct.DataBind();  


      }  
      else  
      {  
          dvProduct.DataSource = GetCustomMadeDataTable();  


          dvProduct.DataBind();  
      }  
  }  



}  

public DataTable GetCustomMadeDataTable()  
{  

  //Create a new DataTable object  

  System.Data.DataTable objDataTable = new System.Data.DataTable();  

  //Create three columns with string as their type  

  objDataTable.Columns.Add("Id", typeof(string));  
  objDataTable.Columns.Add("Column1", typeof(string));  
  objDataTable.Columns.Add("Column2", typeof(string));  
  objDataTable.Columns.Add("Column3", typeof(string));  


  //Adding some data in the rows of this DataTable  
  DataRow dr;  
  for (int i = 0; i <= 5; i++)  
  {  

      dr = objDataTable.NewRow();  
      dr[0] = i.ToString();  
      dr[1] = "Column1Data" + i.ToString();  
      dr[2] = "Column2Data" + i.ToString();  
      dr[3] = "Column3Data" + i.ToString();  
      objDataTable.Rows.Add(dr);  


  }  
  DataColumn[] dcPk = new DataColumn[1];  
  dcPk[0] = objDataTable.Columns["Id"];  
  objDataTable.PrimaryKey = dcPk;  
  Session["strTemp"] = objDataTable;  


  return objDataTable;  
}  
protected void rdoButton_SelectedIndexChanged(object sender, EventArgs e)  
{  
  RadioButtonList rdoButtons = (RadioButtonList)sender;  
  PopupControlExtender popupControl =  
(PopupControlExtender)rdoButtons.NamingContainer.FindControl("popupControl");  

  // Popup result is the selected category  
  popupControl.Commit(rdoButtons.SelectedItem.Text);  

}  
}

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