private static Stream ResizeImage(Stream fileimage, int maxWidth, int maxHeight)
        {
            fileimage.Position = 0;
            using (var bitmap = SKBitmap.Decode(fileimage))
            {
                var ratioX = (float) maxWidth / bitmap.Width;
                var ratioY = (float) maxHeight / bitmap.Height;
                var ratio = Math.Min(ratioX, ratioY);

                using (var toBitmap = new SKBitmap((int) Math.Round(bitmap.Width * ratio),
                    (int) Math.Round(bitmap.Height * ratio), bitmap.ColorType, bitmap.AlphaType))
                using (var canvas = new SKCanvas(toBitmap))
                {
                    canvas.SetMatrix(SKMatrix.MakeScale(ratio, ratio));
                    canvas.DrawBitmap(bitmap, 0, 0);
                    canvas.ResetMatrix();
                    canvas.Flush();
                    canvas.Dispose();

                    using (var image = SKImage.FromBitmap(toBitmap))
                    using (var data = image.Encode(SKEncodedImageFormat.Png, 100))
                    {
                        var stream = new MemoryStream();
                        data.SaveTo(stream);
                        return stream;
                    }
                }
            }
        }