Ajax connection with asp.net codebehind and runtime compilation trouble

Question

Now i understand that this might not be the most efficient method, or necessarily the industry standard and correct method, but it works for my small use edge case where data security is not much of a concern.

As it turn's out i wasn't too far off the mark but as makeMoney2010 mentioned i couldn't call the aspx.vb file directly so i attached it instead to an empty page and called that page to act as a background processor of information. (Most likely incorrect terminology)

The below code should guide anyone else who doesn't know ajax and vb asp.net but needs for some or other reason that defies the norm to be able to call functions on the server from javascript and return some data from a run time compiled codebehind file.

Core.aspx (Background Processor)

<%@ Page Language="vb" AutoEventWireup="true"  Src="Core.aspx.vb" Inherits="CoreFunctionality"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Processing Data...</title>
</head>

<body>
Processing Data, Please Wait...
</body>
</html>

Core.aspx.vb (The serverside script)

    Imports System.Web
    Imports System.Web.Services
    Imports System.Web.Services.Protocols
    Imports System.Web.Script.Services

public partial Class CoreFunctionality
    Inherits System.Web.UI.Page

        <WebMethod()> _
        Public Shared Function GetLessonList(ByVal crsName As String) As String
        If crsName = "" Then
            return String.Format("It's blank Jim.", crsName)
        Else
            return String.Format("Oodles of list data here!!!", crsName)
        End If
    End Function


End Class

ClientSide.js (Client side javascript)

function GetSegListFromServer(strData){
    $.ajax({
        type: "post",
        url: "Scripts/Core.aspx/DoSomenthig",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        //data: '{"selCourse":"'+crsName+'"}',
        data: '{"lsnName":"'+lsnName+'", "crsName":"'+crsName+'"}',
        success: function(result){
            ProcessReturnedData(result.d);
        },
        error: function (xhr, status, error) {
            AjaxErrorAlert(error);
        }       
    });
}

function ProcessReturnedData(){
    alert("@TODO:");
}

//Generic Ajax error handler
function AjaxErrorAlert(error){
    alert("AJAX Error: "+error);
}