FullCalender ServerCode for JSON
===

I'm using VisualBasic for my ASPX Programming and want to do a JSON-feed for the fullcalendar.
I have this:

    $('#calendar').fullCalendar('addEventSource','KalenderEvents.asmx/Test');

 
<br/>

    Imports System.Web
    Imports System.Web.UI
    Imports System.Web.Services
    Imports System.Web.UI.WebControls
    Imports System.Web.Script.Services
    Imports System.Web.Services.Protocols
    Imports System.Data.OleDb
    
    <ScriptService()> _
    Partial Public Class ajax
    
        <WebMethod()> _
       Public Shared Function Test(ByVal start As String, ByVal ende As String) As String
            Dim EventSource As String = ""
            Return EventSource
        End Function
    End Class


I get back this: <br/>

> "NetworkError: 403 Forbidden -
> http://localhost:58749/ajax.vb/Test?start=1341093600&ende=1344722400&_=1343731700843" <br/>
>  The Pagetype will not be processed. <br/> Description: The requested page
> type is not processed because it is expressly forbidden.

Do I have to use PHP (I don't really want to) or did I do sth. wrong on the serverside?
I tried the code with an vb-Class as above, an .aspx Page and with an WebService (.asmx).
<br/>
What do I have to do, to sucessfully call the serverside code?