public void RefreshPhotoStream()
        {
            ClearPhotoStream();

            using (MediaLibrary library = new MediaLibrary())
            {
                foreach (PictureAlbum album in library.RootPictureAlbum.Albums)
                {
                    if (album.Name == "Camera Roll")
                    {
                        _pictures   = album.Pictures;
                        _enumerator = _pictures.Reverse().GetEnumerator();

                        AddPhotoSet();

                        break;
                    }
                }
            }
        }
        public void RefreshPhotoStream()
        {
            ClearPhotoStream();

            using (MediaLibrary library = new MediaLibrary())
            {
                foreach (PictureAlbum album in library.RootPictureAlbum.Albums)
                {
                    if (album.Name == "Camera Roll")
                    {
                        _pictures = album.Pictures;
                        _enumerator = _pictures.Reverse().GetEnumerator();

                        AddPhotoSet();

                        break;
                    }
                }
            }
        }