public void OnImageLoaded(object sender, FileLoadedArgs args)
 {
     if (!String.Equals(args.ImageUrl, _challengeTypeModel.ImageUrl))
     {
         return;
     }
     ;
     InvokeOnMainThread(() =>
     {
         ChallengeImage.Image = args.Image;
     });
 }
 public void DownloadImageFromUrlCompleted(FileLoadedArgs args)
 {
     if (!String.Equals(args.ImageUrl, _challengeTypeModel.ImageUrl))
     {
         return;
     }
     ;
     InvokeOnMainThread(() =>
     {
         ChallengeImage.Image = args.Image;
     });
 }