private async Task LoadBrushAsync()
 {
     using (IRandomAccessStream fileStream = await item.ImageFile.OpenReadAsync())
     {
         ImageEffectsBrush.LoadImageFromStream(fileStream);
     }
 }
        private async Task LoadBrushAsync()
        {
            using (var stream = new Windows.Storage.Streams.InMemoryRandomAccessStream())
            {
                await ImageSource.ToStream(stream, BitmapEncoder.BmpEncoderId);

                stream.Seek(0);
                ImageEffectsBrush.LoadImageFromStream(stream);
            }
        }