autocomplete extender not working

Hello,

I m trying to add autocomplete extender in code without using webservice i get the list but it not displaying in final result

My code is as Following

.aspx code----

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Script_Master.aspx.cs" Inherits="ISHM.Admin.Script_Master" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" EnablePartialRendering="true"  EnablePageMethods="true"   runat="server">
</asp:ToolkitScriptManager>
<asp:TextBox ID="Txtsearch" runat="server" ></asp:TextBox>
    <asp:AutoCompleteExtender ID="Txtsearch_AutoCompleteExtender" runat="server"
        DelimiterCharacters="" Enabled="True"  MinimumPrefixLength="1" EnableCaching="true" CompletionSetCount="1" CompletionInterval="1000"
        TargetControlID="Txtsearch" ServiceMethod="getDetail"   UseContextKey="True">
    </asp:AutoCompleteExtender>
    <br />

   
</asp:Content>

--------------------------

aspx.cs code as------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using ISHM.Globalclasses;
using System.Data;

namespace ISHM.Admin
{
    public partial class Script_Master : System.Web.UI.Page
    {
        Query objQry1 = new Query();
        [System.Web.Services.WebMethod]
        [System.Web.Script.Services.ScriptMethod]
        //[System.Web.Script.Services.ScriptMethod()]
        //[System.Web.Services.WebMethod]
        public static List<string> getDetail(string prefixText, int count)
        
        {
            Query objQry = new Query();
            List<string> DetailList = new List<string>();
            DataTable Dt =objQry.GetScriptdetail();
            //DataView dv = new DataView();
            //dv = Dt.DefaultView;
            //dv.RowFilter = "ISINCODE like '%" + prefixText + "%' OR NSECODE like'%" + prefixText + "%' OR NAME like'%" + prefixText + "%'";
            //DataTable DT1 = dv.ToTable();
            for (int i = 0; i < Dt.Rows.Count; i++)
            {   
                DetailList.Add(Dt.Rows[i]["name"].ToString());
            }
            return DetailList;
        }
        protected void Page_Load(object sender, EventArgs e)
        {

        }


    }
}

please help me where is that problem..