public void ClearContent()
 {
     ProgressBar.Value = 0;
     if (ImageContent.Source != null)
     {
         var bitmap = ImageContent.Source as BitmapImage;
         bitmap.DownloadProgress -= Image_DownloadProgress;
     }
     ImageContent.DataContext = null;
     ImageContent.ClearValue(Image.SourceProperty);
     ImageContent.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
     ImageContent.Height     = 0;
     TextContent.ClearValue(TextBlock.TextProperty);
 }