/// <summary>
 /// Releases unmanaged and - optionally - managed resources.
 /// </summary>
 /// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
 protected void Dispose(bool dispose)
 {
     if (dispose)
     {
         ImageSizeCache.Dispose();
         ResizedImageCache.Dispose();
         CroppedImageCache.Dispose();
         EnhancedImageCache.Dispose();
     }
 }