Ajax AutoCompleteExtender .. Need to collect data from my SQL compact database.

Hello,

I've got an Ajax AutoCompleteExtender that I seem to be having trouble with. I followed a basic implementation tutorial..http://www.asp.net/ajaxlibrary/act_AutoComplete_Simple.ashx .. and I was able to populate the static string data from the code behind. I know the function is working properly. I just cannot seem to call the data from a database correctly.

I've got sqlDataSource controls on the same page I work with and they work to populate GridView controls. I just cannot seem to query my SQL compact database from the code behind. The syntax seems to be correct, according to intellisence but it simply does nothing when I start typing a search in target control.

Any Suggestions?

The control is registered in the Web.config file for all pages.

ASP for ToolkitScriptManager:

<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"></ajaxToolkit:ToolkitScriptManager>

ASP for AutoCompleteExtender:

<asp:TextBox ID="ClientSearch" runat="Server" Width="227px"></asp:TextBox><ajaxToolkit:AutoCompleteExtender
        CompletionListCssClass="AutoExtender"
        CompletionListItemCssClass="AutoExtenderListItem"
        CompletionListHighlightedItemCssClass="AutoExtenderItemHighlighted"
        ID="AutoCompleteExtender1"
        TargetControlID="ClientSearch"
        runat="server" 
        ServiceMethod="GetCompletionList" 
        MinimumPrefixLength="1"
        UseContextKey="True"></ajaxToolkit:AutoCompleteExtender><asp:Button ID="SearchSubmit" runat="Server" Text="Search" />

Below is were I'm stuck..I cannot seem to find a good method here to call the data from my SQL compact database...I do have a ConnectionString on the Web.config and I am able to get that same data with an SQLdatasource control..I just cannot get it with any of the code-behind methods I have tried from any tutorial..

Here is the page Code Behind (C#)

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


public partial class _Default : System.Web.UI.Page

{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    [System.Web.Script.Services.ScriptMethod()]
    [System.Web.Services.WebMethod]
    public static List<string> GetCompletionList(string prefixText)
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString());
        con.Open();
        SqlCommand cmd = new SqlCommand("select * from Current where Name like @Name+'%'", con);
        cmd.Parameters.AddWithValue("@Name", prefixText);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        List<string> Names = new List<string>();
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            Names.Add(dt.Rows[i][1].ToString());
        }
        return Names;
    }


} 

Here is are my Connection Strings in the Web.config

<connectionStrings><add name="ConnectionString" connectionString="Data Source=|DataDirectory|\Clients.sdf" providerName="System.Data.SqlServerCe.4.0" /><add name="ClientsEntities" connectionString="metadata=res://*/App_Code.Model.csdl|res://*/App_Code.Model.ssdl|res://*/App_Code.Model.msl;provider=System.Data.SqlServerCe.4.0;provider connection string=&quot;data source=|DataDirectory|\Clients.sdf&quot;" providerName="System.Data.EntityClient" /></connectionStrings>

What am I doing wrong? I'm open to criticism. I'm a roast, baste me..