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Ajax Cascading drop down method error 500!

Posted By:      Posted Date: August 27, 2010    Points: 0   Category :ASP.Net

Sorry to trouble you all with something that has already been posted a million times but I have tried everything I can and stuck with for about 10 days now. Please help. I have created 2 tables Categories, Subcategories.

Categories table has Category_ID(Primary Key) and "Category" fields. Subcat table has SubcatID(Primary Key, Sub_cat and Category_ID(Foreign Key). Here's the code of the asmx file.

Service methods used in ASPX file ServiceMethod="GetVendors" and ServiceMethod="GetContactsForVendor". Please help me find the source of the method erro 500 and I will be very greatful.

<%@ WebService Language="VB" Class="CascadingDropdown1" %>

Imports System.Web.Script.Services

Imports AjaxControlToolkit

Imports System.Web

Imports System.Web.Services

Imports System.Web.Services.Protocols

Imports System.Collections.Generic

Imports System.Collections.Specialized

Imports System.Data.SqlClient

<ScriptService()> _
Public Class CascadingDropdown1
Inherits System.Web.Services.WebService

<WebMethod()> _
Public Function GetVendors(ByVal knownCategoryValues As String, ByVal category As String) As Cascadi

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