Hi guys.

I am really at my wits end, and I am going crazy because I am not getting much help ( by searching google etc. )

The situation:

I simply do not know how to enable CORS properly in my WCF Service, so that I can communicate through JQuery or AJAX. I have tried everything and I keep hitting a brick wall.....

My global.asax file looks like This - in a miserable attempt to enable CORS:
Code:
    Imports System.Web.SessionState

    Public Class Global_asax
        Inherits System.Web.HttpApplication

        ''' <summary>
        ''' Enables cross domain POST, MERGE, DELETE for Firefox and Chrome
        ''' This requires:
        ''' <system.ServiceModel>
        '''     <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
        ''' </summary>
        Shared Sub EnableCrossDomain()
            Dim origin As String = HttpContext.Current.Request.Headers("Origin")
            If String.IsNullOrEmpty(origin) Then
                Return
            End If
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", origin)
            Dim method As String = HttpContext.Current.Request.Headers("Access-Control-Request-Method")
            If (Not String.IsNullOrEmpty(method)) Then
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", method)
            End If
            Dim headers As String = HttpContext.Current.Request.Headers("Access-Control-Request-Headers")
            If (Not String.IsNullOrEmpty(headers)) Then
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", headers)
            End If
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Credentials", "true")
            If HttpContext.Current.Request.HttpMethod = "OPTIONS" Then
                HttpContext.Current.Response.StatusCode = 204
                HttpContext.Current.Response.End()
            End If
        End Sub

        Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
            ' Fires when the application is started
        End Sub

        Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
            ' Fires when the session is started
        End Sub

        Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)
            'HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*")
            'If HttpContext.Current.Request.HttpMethod = "OPTIONS" Then
            '    HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "POST, PUT, DELETE")

            '    HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept")
            '    HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000")
            '    HttpContext.Current.Response.End()
            'End If
            '' Fires at the beginning of each request
            EnableCrossDomain()

        End Sub

        Sub Application_AuthenticateRequest(ByVal sender As Object, ByVal e As EventArgs)
            ' Fires upon attempting to authenticate the use
        End Sub

        Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
            ' Fires when an error occurs
        End Sub

        Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
            ' Fires when the session ends
        End Sub

        Sub Application_End(ByVal sender As Object, ByVal e As EventArgs)
            ' Fires when the application ends
        End Sub

    End Class
My Web.Config file looks like This :
HTML Code:
    <?xml version="1.0"?>
    <configuration>

        <system.web>
          <compilation debug="true" targetFramework="4.0" />
        </system.web>

    <system.serviceModel>
        <!--DEFINE YOUR SERVICES WITH ENDPOINTS-->
        <services>
            <service name="UmbrellaMobileService"
           
                behaviorConfiguration="MyServiceBehavior">

                 <endpoint
                    address=""
                    binding="webHttpBinding"
                    bindingConfiguration="webHttpBindingWithJsonP"
                    behaviorConfiguration="webEndPointBehavior"
                    name="webEndPoint"
                    contract="IUmbrellaMobileService"/>
           
            </service>
        </services>
        
        <bindings>

            <webHttpBinding>

              <binding name="webHttpBindingWithJsonP" crossDomainScriptAccessEnabled="true" />

            </webHttpBinding>

          </bindings>

        <behaviors>
            <!--SERVICE BEHAVIORS-->
            <serviceBehaviors>
                <behavior name="MyServiceBehavior">
                    <serviceMetadata httpGetEnabled="true"/>
                    <serviceDebug includeExceptionDetailInFaults="true"/>
                </behavior>
            </serviceBehaviors>

            <!--ENDPOINT BEHAVIORS-->
            <endpointBehaviors>
                <behavior name="webEndPointBehavior">
                    <webHttp defaultOutgoingResponseFormat="Json" defaultBodyStyle="Bare"/>
                </behavior>
            </endpointBehaviors>

        </behaviors>
        
        <serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true"/>
    </system.serviceModel>
      <system.webServer>
        <modules runAllManagedModulesForAllRequests="true"/>
        <httpProtocol>
          <customHeaders>
            <add name="Access-Control-Allow-Origin" value="*"/>
          </customHeaders>
        </httpProtocol>
      </system.webServer>


    </configuration>
I need to read the data from my Service in JSON format and display it on my mobile app - but it doesn't matter what I do, it just doesn't happen.

I do not know what else to do and how to do it to enable CORS, so that I can communicate properly

Can anyone help?