Erreur 500 CascadingDropdownList

Bonjour a tous,

Pour un projet de developpement de WebApplication, je suis en train d'essayé de faire des cascading dropdownlist via le toolkit AjaxControlToolkit. J'ai suivit l'aide suivante mais je bloque. En effet, j'ai une erreur 500 lorsque j’exécute mon projet. Je pense pourtant ne rien avoir oublier. Quelqu'un voit-il ou je me suis planté ?
Voici mes sources :

cascad.aspx

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<%@ Page Title="" Language="vb" AutoEventWireup="false" MasterPageFile="~/Site.Master" CodeBehind="~/cascad.asmx.vb" Inherits="Cascading2.WebForm1" EnableEventValidation="false" %>
<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <p>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <br />
        Country : <asp:DropDownList ID="DDLCountry" runat="server">
        </asp:DropDownList>
        <asp:CascadingDropDown ID="DDLCountry_CascadingDropDown" 
            runat="server" 
            TargetControlID="DDLCountry" 
            Category="Country" 
            PromptText="Select a country" 
            ServiceMethod="GetCountry"
            ServicePath="~/cascad.asmx">
 
        </asp:CascadingDropDown>
        <br /><br />
 
        Building : <asp:DropDownList ID="DDLBuilding" runat="server">
        </asp:DropDownList>
        <asp:CascadingDropDown ID="DDLBuilding_CascadingDropDown" 
            runat="server" 
            TargetControlID="DDLBuilding" 
            Category="Building" 
            ParentControlID="DDLCountry" 
            ServiceMethod="GetCountry" 
            ServicePath="~/cascad.asmx" PromptText="Select Building">
        </asp:CascadingDropDown>
        <br /><br />
 
    </p>
</asp:Content>

cascad.asmx.vb

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Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.ComponentModel
Imports System
Imports System.Web
Imports System.Collections
Imports System.Collections.Generic
Imports System.Collections.Specialized
Imports AjaxControlToolkit
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
 
' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
<System.Web.Script.Services.ScriptService()> _
<System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _
<System.Web.Services.WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<ToolboxItem(False)> _
Public Class cascad
    Inherits System.Web.Services.WebService
 
 
 
    Public Shared Function GetCountry(ByVal knownCategoryValues As String, ByVal category As String) As CascadingDropDownNameValue()
 
        Dim strConnection As String = ConfigurationManager.ConnectionStrings("IT_Rent_connection").ConnectionString
        Dim sqlConn As SqlConnection = New SqlConnection(strConnection)
        Dim strConfQuery As String = "SELECT * FROM COUNTRY"
        Dim cmdFetchConf As SqlCommand = New SqlCommand(strConfQuery, sqlConn)
 
        Dim dtrConf As SqlDataReader
        Dim myConferences As New List(Of CascadingDropDownNameValue)
 
        sqlConn.Open()
        dtrConf = cmdFetchConf.ExecuteReader
 
        While dtrConf.Read()
            Dim strConfName As String = dtrConf("name_country").ToString
            Dim strConfId As String = dtrConf("id_country").ToString
 
            myConferences.Add(New CascadingDropDownNameValue(strConfName, strConfId))
        End While
 
        Return myConferences.ToArray
    End Function
 
End Class

et enfin le web.config

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<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <connectionStrings>
    <add name="IT_Rent_connection" connectionString="Data Source=LVLD60215571A;Initial Catalog=IT_RENT;Integrated Security=True"
  providerName="System.Data.SqlClient" />
    <add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient" />
  </connectionStrings>
  <system.web>
    <compilation debug="true" strict="false" explicit="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
        <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
      </assemblies>
    </compilation>
    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login.aspx" timeout="2880" />
    </authentication>
    <membership>
      <providers>
        <clear />
        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />
      </providers>
    </membership>
    <profile>
      <providers>
        <clear />
        <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/" />
      </providers>
    </profile>
    <roleManager enabled="false">
      <providers>
        <clear />
        <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />
        <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />
      </providers>
    </roleManager>
    <pages>
      <controls>
        <add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
      </controls>
    </pages>
  </system.web>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true" />
  </system.webServer>
</configuration>

Merci d'avance de votre aide.

DeWaRs