Ajax AutoCompleteExtender not hitting code behind in userControl C#

Question

I'm trying to use the Ajax autoCompleteExtender to auto complete my textboxes using a sql query in my code behind. The problem I'm having is that my code behind isn't being hit at all.

What happens instead is my autocomplete options display as the code from my masterpage.

I've done some research and the problem might be that my textboxes are in an ascx file called from my aspx file but I can't figure out a way around it. I've even tried pointing the ServicePath to a webService and it still doesn't hit.

Any input would help, thank you!

Here's my relevant code:

Aspx File:

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage/Admin.Master" AutoEventWireup="true" EnableEventValidation="false" %>
<%@ Register TagPrefix="AdminSearch" TagName="AdminSearch" Src="AdminSearch.ascx" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<AdminSearch:AdminSearch runat="server" ID="AdminSearch" />
</asp:Content>

Ascx File:

<%@ Control Language="C#" ClassName="WebUserControl" AutoEventWireup="true" EnableViewState="true" Inherits="AdminSearch" CodeBehind="AdminSearch.ascx.cs" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<link href="../Style/Search/AdminSearch.css" rel="stylesheet" />
<script src="../Scripts/js/Search/AdminSearch.js"></script>

<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods = "true">
</asp:ScriptManager>

<td class="g3">
        <br />
        <asp:TextBox ID="TextBoxTierProfile" CssClass="g3" runat="server"></asp:TextBox><br />
        <cc1:AutoCompleteExtender ServiceMethod="SearchProfiles" ServicePath="~/AutoComplete.asmx"
            MinimumPrefixLength="2"
            CompletionInterval="1" EnableCaching="true" CompletionSetCount="10"
            TargetControlID="TextBoxTierProfile" 
            ID="AutoCompleteExtender2" runat="server" FirstRowSelected="false">
        </cc1:AutoCompleteExtender>
    </td>

Asmx File:

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

namespace InternalTools.Admin.Search
{
    /// <summary>
    /// Summary description for AutoComplete
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    [System.Web.Script.Services.ScriptService]
    public class AutoComplete : System.Web.Services.WebService
    {
        static string sConnection;

        public AutoComplete()
        {
            if (HttpContext.Current.Request.ServerVariables["LOCAL_ADDR"].ToString().Contains("127.0.0.1"))
            {
                sConnection = ConfigurationManager.ConnectionStrings["Reporting"].ToString();
            }
            else
            {
                sConnection = ConfigurationManager.ConnectionStrings["live"].ToString();
            }
        }

        [System.Web.Script.Services.ScriptMethod]
        [WebMethod]
        public static string[] SearchProfiles(string prefixText, int count)
        {

            using (SqlConnection conn = new SqlConnection())
            {
                conn.ConnectionString = sConnection;
                using (SqlCommand cmd = new SqlCommand())
                {
                    cmd.CommandText = (I've cut out the query for security reasons)
                    cmd.Parameters.AddWithValue("@SearchText", prefixText);
                    cmd.Connection = conn;
                    conn.Open();
                    List<string> profiles = new List<string>();
                    using (SqlDataReader sdr = cmd.ExecuteReader())
                    {
                        while (sdr.Read())
                        {
                            profiles.Add(sdr["PROFILENAME"].ToString());
                        }
                    }
                    conn.Close();
                    return profiles.ToArray();
                }
            }
        }
    }
}