private void SetPictureStream()
        {
            var thumbnail     = BitmapHelpers.CreateThumbnail(_file.Path, 500, 500, Guid.NewGuid().ToString());
            var fileStream    = new FileStream(thumbnail, FileMode.Open);
            var streamContent = new StreamContent(fileStream);

            _app.SetPictureStream(streamContent);
        }
        private void DisplayThumbnail()
        {
            var thumbnail = BitmapHelpers.CreateThumbnail(_file.Path, 450, 450);

            _app.ShowPicture(thumbnail);
        }