Problem with AutoCompleteExtender control?

Question

Hello Sir i am working in ajax and use AutoCompleteExtender control with WebService. I want to  output in single TextBox like when we write A word then all "a" type related record show.
MyWebService:
  [WebMethod]
  public static List<string> Record (string s)
  {
  DataSet ds = new DataSet();
  SqlConnection con = new SqlConnection("database=asha;server=.;integrated security=true");
  SqlCommand cmd = new SqlCommand("select* from manish WHERE Name LIKE '" + s + "%' ", con);
  cmd.Parameters.AddWithValue("@Name", s);
  SqlDataAdapter da = new SqlDataAdapter(cmd);
  DataTable dt = new DataTable();
  da.Fill(dt);
  List<string> name = new List<string>();
  for (int i = 1; i < dt.Rows.Count; i++)
  {
   name.Add(dt.Rows[i][0].ToString());
  }
       return name;
  }
}

 Default.aspx code;


<asp:ScriptManager ID="ScriptManager1" runat="server">
  <Services>
  <asp:ServiceReference Path="~/WebService.asmx"/>
  </Services>
  </asp:ScriptManager>
  <div>
  <asp:TextBox ID="TextBox1"runat="server"></asp:Te
<asp:AutoCompleteExtenderID="AutoCompleteExtender1"runat="server"TargetControlID="TextBox1"ServiceMethod="Record"ServicePath="~/WebService.asmx"  MinimumPrefixLength="1" EnableCaching="true" CompletionSetCount="1" CompletionInterval="1000" >
  </asp:AutoCompleteExtender>
  </div>
When we run the program then only textbox show and write any word then no related record find.