[VB.NET] Login via codice a pagina Web restituisce sempre la pagina di login

[cassano]

Ciao a tutti ho la necessita di effettuare un login a delle pagine web via codice ma non ci riesco ecco il codice, praticamente mi si preesenta sempre la pagina di login.

 Dim WEBrequest As HttpWebRequest = CType(HttpWebRequest.Create("http://www.XXXXX.XX/shop/show/brand/20"), HttpWebRequest)
            WEBrequest.AllowAutoRedirect = True
            WEBrequest.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; it; rv:1.9.2.16) Gecko/20110319 Firefox/3.6.16"
            WEBrequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
            WEBrequest.Method = "POST"
            WEBrequest.CookieContainer = New CookieContainer
            Dim POSTdata As String = "email=XXXXXX@gmail.com&password=XXXX"
            Dim byteArray As Byte() = encoding.UTF8.GetBytes(POSTdata)
            WEBrequest.ContentType = "application/x-www-form-urlencoded"
            Dim dataSTREAM As Stream = WEBrequest.GetRequestStream()
            dataSTREAM.Write(byteArray, 0, byteArray.Length)
            dataSTREAM.Close()
            Dim WEBresponse As HttpWebResponse = CType(WEBrequest.GetResponse, HttpWebResponse)
            dataSTREAM = WEBresponse.GetResponseStream()
            Dim reader As New StreamReader(dataSTREAM)
            Dim responseFromServer As String = reader.ReadToEnd()
            reader.Close()
            dataSTREAM.Close()
            WEBresponse.Close()

[cassano]

Up please.