I'm trying to use Ajax Control Toolkit's Autocomplete extender with a WCF Service.

This question is almost what I'm looking for, one of the answers points to a tutorial but I can't get it to work.

In my solution I have a web form application project and a WCF service library project.

One of the properties of the Autocomplete extender is ServicePath which the tutorial points to a svc file:

<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<asp:TextBox runat="server" ID="myTextBox" Width="300" autocomplete="off" />
<ajaxToolkit:AutoCompleteExtender
runat="server" 
BehaviorID="AutoCompleteEx"
ID="autoComplete1" 
TargetControlID="myTextBox"
ServicePath="Autocomplete.svc" 
ServiceMethod="GetCompletionList"
MinimumPrefixLength="0" 
CompletionInterval="1000"
EnableCaching="true">
</ajaxToolkit:AutoCompleteExtender>
</div>
</form>

Right now in ServicePath I'm pointing to the http address (http://localhost:8731/Design_Time_Addresses/WebApp.WcfServiceLibrary/ProductService/) that my WCF Service is running, but it just don't works.