WP7 Serialize Image from Chooser

        public static void UploadPicture()
        {
            PhotoChooserTask photoChooser = new PhotoChooserTask();
            photoChooser.ShowCamera = true;
            photoChooser.Show();
            photoChooser.Completed += new EventHandler<PhotoResult>(photoChooser_Completed);
        }
        static void photoChooser_Completed(object sender, PhotoResult e)
        {
            if (e.TaskResult == TaskResult.OK)
            {
                Stream stream = (e.ChosenPhoto);
                byte[] buffer = new byte[16 * 1024];
                MemoryStream ms = new MemoryStream();
                int read;
                while ((read = stream.Read(buffer, 0, buffer.Length)) > 0)
                {
                    ms.Write(buffer, 0, read);
                }

                string jsonData = "{" +
                    App.ViewModel.CurrentUserJson +
                    ",\"image\":" +
                    JsonSerializer.Serialize(ms.ToArray()) +
                    "}";

                TwitFaceClient uploadPhoto = new TwitFaceClient();
                uploadPhoto.SendRequest(TwitFaceEndpoints.UploadPhoto, jsonData);
                uploadPhoto.TwitFaceRequestComplete += new TwitFaceRequestCompleteHandler(uploadPhoto_TwitFaceRequestComplete);
            }
        }
        static void uploadPhoto_TwitFaceRequestComplete(bool complete, object result)
        {
            if (complete)
            {
                MessageBox.Show("photo uploaded");
            }
            else
            {
                MessageBox.Show("photo upload failed", "FAIL!", MessageBoxButton.OK);
            }
        }