Dim request As WebRequest = WebRequest.Create("http://www.xxxx.it/xxx.aspx")
            request.Method = "POST"
            request.Timeout = 10000
            request.Credentials = CredentialCache.DefaultCredentials
            request.Credentials = New System.Net.NetworkCredential("administrator", "password", "domain")
            Dim postData As String = "test"
            Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
            request.ContentType = "application/x-www-form-urlencoded"
            request.ContentLength = byteArray.Length
            Dim dataStream As Stream = request.GetRequestStream()
            dataStream.Write(byteArray, 0, byteArray.Length)
            dataStream.Close()