JQuery Auto complete and ASP.net

JQuery Auto complete and ASP.net

I am new here in the forum and also new to the JQuery.  I was finding how to use JQuery Auto complete in my asp.net on Internet , I come through following article
which shows how to use JQuery Auto complete with asp.net. I download its source code and I ran it successfully, his  codes working good.

But when I integrate it in my project. It is not working. I found that his project is made on asp.net 3.5 and my project is made on asp.net 2.0

This is my code which I am using

ASPX page code
  2. <script language="javascript" type="text/javascript">
  3.   $(document).ready(function() {

  5.             //Code to fetch
  6.             $.ajax({
  7.                 type: "POST",
  8.                 url: "../AutoComplete.asmx/GetCompleteActorList",
  9.                 dataType: "json",
  10.                 data: "{}",
  11.                 contentType: "application/json; charset=utf-8",
  12.                 success: function(data) {
  13.                     var datafromServer = data.d.split(":");
  14.                     $("[id$='actorList']").autocomplete({
  15.                         source: datafromServer
  16.                     });
  17.                 },
  18.                 error: function(XMLHttpRequest, textStatus, errorThrown) {
  19.                     alert(textStatus);
  20.                 }
  21.             });
  22.         });
  23. </script>
In the form part of aspx page
  1. <asp:TextBox ID="actorList" runat="server" CssClass="input"/>
This is my Webservice

  2. <WebMethod()> _
  3.   Public Function GetCompletionActorList() As String
  4.     Dim sbActor As New StringBuilder()
  5.     Dim actorAPI As New ActorBLL
  6.     Dim actor As Q8movies.ActorDetailDataTable = actorAPI.GetActorDetail()

  8.     Try
  9.       For i As Integer = 0 To actor.Rows.Count - 1
  10.         sbActor.AppendFormat("{0}:", actor.Rows(i).Item("ActorName"))
  11.       Next

  13.       'Removes the extra ":"
  14.       sbActor = sbActor.Remove(sbActor.Length - 1, 1)
  15.     Catch ex As Exception
  16.       'Setup a breakpoint here 
  17.       'to verify any exceptions raised.
  18.       Dim exp As String = ex.ToString()
  19.     End Try
  20.     Return sbActor.ToString()
  21.   End Function


So can somebody help me to know where I am doing mistake. Or is it like asp.net 3.5 can be only use for this. But I feel that is not the case. Kindly help me out to solve this problem.