Method Error 500

Bonsoir

Je voudrais juste ajouter une fonctionnalité Ajax à mes cascadedropdowmenu mais à chaque fois je reçois la même erreur quand je visualize la page.
En cherchant sur internet dans les forums de ASP.NET le seul problème qui s'opposait c'était l'absence de la balise

Code:

<System.Web.Script.Services.ScriptService()> _

qui existe déjà dans mon web service. En ce qui concerne les Datasets j'ai tout vérifier ça fonctionne, donc où est le problème.

web service

Code:

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Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports AjaxControlToolkit
Imports System.Data
Imports System.Data.SqlClient
Imports System.Collections.Generic
 
' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
 
<WebService(Namespace:="http://tempuri.org/")> _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
<System.Web.Script.Services.ScriptService()> _
Public Class CityService
    Inherits System.Web.Services.WebService
 
    <WebMethod()> _
    Public Function GetCities(ByVal knowncategorievalues As String, ByVal category As String) As CascadingDropDownNameValue()
 
        Dim cityAdapter As New dsCitiesTableAdapters.CitiesTableAdapter
 
        Dim makeValues As New List(Of CascadingDropDownNameValue)()
 
        For Each row As DataRow In cityAdapter.GetAllCities
            makeValues.Add(New CascadingDropDownNameValue(row("BranchID").ToString(), row("CityName").ToString(), row("BranchName").ToString()))
        Next
 
        Return makeValues.ToArray()
 
 
 
    End Function
 
End Class

la page ASPX

Code:

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<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
 
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        .style1
        {
            text-align: center;
        }
        .style2
        {
            width: 46%;
        }
        .style4
        {
            width: 250px;
            text-align: right;
        }
        .style5
        {
            width: 1px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div class="style1">
    <div>
 
    </div>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <div class="style1">
            <br />
            <table class="style2">
                <tr>
                    <td class="style4">
                        <span lang="en-us">City:</span></td>
                    <td class="style5">
                        &nbsp;</td>
                    <td>
                        <asp:DropDownList ID="CityDDL" runat="server" 
                            Height="16px" style="z-index: 1; margin-left: 0px" Width="146px">
                        </asp:DropDownList>
                    </td>
                </tr>
                <tr>
                    <td class="style4">
                        <span lang="en-us">Branch Name:</span></td>
                    <td class="style5">
                        &nbsp;</td>
                    <td>
                        <asp:DropDownList ID="BranchNameDDL" runat="server" 
                            Height="16px" style="z-index: 1; margin-left: 0px" Width="146px">
                        </asp:DropDownList>
                    </td>
                </tr>
                <tr>
                    <td class="style4">
                        <span lang="en-us">Branch ID:</span></td>
                    <td class="style5">
                        &nbsp;</td>
                    <td>
                        <asp:DropDownList ID="BranchIDDDL" runat="server"  
                            Height="16px" style="z-index: 1; margin-left: 0px" Width="146px">
                        </asp:DropDownList>
                    </td>
                </tr>
            </table>
            <br />
            <br />
            <br />
        </div>
    </div>
<cc1:CascadingDropDown ID="CityCascadingDropDown" runat="server" TargetControlID ="CityDDL" Category ="City" PromptText ="Please Select Your City ..." LoadingText ="Retrieving Information" ServicePath ="CityService.asmx" ServiceMethod ="GetCities">
    </cc1:CascadingDropDown>
    </form>
 
</body>
</html>

Merci :ccool: