// Reading preview
 private void ReadPreview_button_Click(object sender, RoutedEventArgs e)
 {
     if (!selected_result_track.Equals(default(DeezerTrack)))
     {
         readPreview_button.IsEnabled = false;
         selectedTrack_readPreview_button.IsEnabled = false;
         blindtest.readPreview(selected_result_track);
         readPreview_button.Content = "Downloading preview...";
     }
 }
        // When a result has been selected in comboBox, loading information in UI
        private void Results_comboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (results_comboBox.SelectedIndex != -1)
            {
                selected_result_track = blindtest.getTrack(results_comboBox.SelectedIndex);

                if (selected_result_track.Equals(default(DeezerTrack)))
                {
                    title_label.Text  = "Error";
                    artist_label.Text = "Error";
                    album_label.Text  = "Error";
                    BitmapImage bmpImg = new BitmapImage();
                    bmpImg.UriSource   = new Uri("ms-appx:///Assets/default-track.png");
                    track_Image.Source = bmpImg;
                }

                else
                {
                    title_label.Text  = selected_result_track.title;
                    artist_label.Text = selected_result_track.artist.name;
                    album_label.Text  = selected_result_track.album.title;
                    BitmapImage bmpImg = new BitmapImage();
                    bmpImg.UriSource   = new Uri(selected_result_track.album.cover_medium);
                    track_Image.Source = bmpImg;
                }
            }
        }