public async Task LoadAsync()
 {
     IsLoading = true;
     if (Recognitions.Count == 0)
     {
         Recognitions.Clear();
         AddRecognitionsToView(await server.LoadAsync());
     }
     IsLoading = false;
 }
        public async Task ClearAsync()
        {
            IsClearing = true;

            await server.ClearAsync();

            Recognitions.Clear();
            Photos.Clear();
            ImagesCounter = 0;

            IsClearing = false;
        }