Autocompleteextender not working

Hi All,

I am beginner to ajax control. I am using AutoCompleteExtender Textbox. My project is not showing any error. It compiled successfully but textbox not displaying any autocomplete suggestions as i type.

Please tell me whats the error. I am using asp.net 3.5.

Here is Code :

default.aspx:


<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>





   



   

  
       
           
           
                   
       
       

     
       
       

       
       
 
       

   

WebService :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Configuration;
using System.Web.Services;
using System.Data;
using System.Data.SqlClient;


///

/// Summary description for AutoCompleteTextBox
///

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
// [System.Web.Script.Services.ScriptService]
public class AutoCompleteTextBox : System.Web.Services.WebService {

    //public AutoCompleteTextBox () {

        //Uncomment the following line if using designed components
        //InitializeComponent();
    //}

    [WebMethod]
    public string[] getProductList( string prefixText)
    {
        string conString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
        SqlConnection con = new SqlConnection(conString);
        string strQuery = "Select ProductName From Products Where ProductName LIKE '" + prefixText + "%'";
        SqlCommand cmd = new SqlCommand(strQuery, con);
        con.Open();
        SqlDataAdapter da = new SqlDataAdapter();
        da.SelectCommand = cmd;
        DataSet ds = new DataSet();
        da.Fill(ds);

        string[] countName = new string[ds.Tables[0].Rows.Count];
        int i = 0;
        try
        {
            foreach(DataRow dr in ds.Tables[0].Rows)
            {
                countName.SetValue(dr["ProductName"].ToString(),i);
                i++;
            }
        }
        catch(Exception err)
        {
            throw err;
        }
        finally{con.Close();}
        return countName;
    }
   
}