Autocomplete textbox Nothing Happen

Question

Hi  everyone,

 

This my Code when i run it Nothing Happen

 

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">

</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
 <div id="page-wrapper" >
         <div class="col-md-12">
  <!-- Form Elements -->
         <div class="panel panel-info">
         <div class="panel-heading">
               <h3 style="text-shadow: 2px 2px #79aed8;">PRODUCT ENTRY</h3>
          </div>
          <div class="panel-body">
          <table>
                <tr>
                    <td>
                        <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="True"></asp:ScriptManager>
                        <asp:Label ID="lblEmployee" Text="Employee Search" runat="server"></asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="txtPcode" runat="server" Width="200" placeholder="Employee Name"></asp:TextBox>
                        <ajaxToolkit:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" TargetControlID="txtPcode" ServiceMethod="getname" EnableCaching="True" MinimumPrefixLength="1" CompletionInterval="10" CompletionSetCount="1"> </ajaxToolkit:AutoCompleteExtender>
                    </td>
                </tr>
            </table>
            </div>
          </div>
         </div>
      </div>
</asp:Content>

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.Configuration;
using System.Data.SqlClient;
using System.Web.Script.Services;
using System.Web.Services;

namespace Product
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        [ScriptMethod()]
        [WebMethod]
        public static List<string> getname(string name)
        {
            SqlConnection con;
            SqlCommand cmd;

            con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbcon1"].ConnectionString);
            cmd = new SqlCommand();
            cmd.Connection = con;

            con.Open();
            string query = "select * from Product where subhead like '%'+ @searchname +'%'";
            cmd = new SqlCommand(query, con);
            cmd.Parameters.AddWithValue("@searchname", name);
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            sda.Fill(dt);

            List<string> names = new List<string>();
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                names.Add(dt.Rows[i][i].ToString());
            }
            return names;
        }
    }
}

Please help me to how to implement auto complete textbox

 

Thanks ....