private void button1_Click(object sender, EventArgs e)
        {
            var myView = new MyView();
            var source = PresentationSource.FromVisual(myView);
            var dpi    = source != null ? source.CompositionTarget.TransformToDevice.M11 * 96 : 96;

            var visualSize = new System.Windows.Size(Width, Height);
            var canvas     = new Canvas()
            {
                Background = new SolidColorBrush(Colors.White)
            };

            canvas.Children.Add(myView);
            canvas.Measure(visualSize);
            canvas.Arrange(new Rect(visualSize));
            canvas.UpdateLayout();
            myView.Measure(visualSize);
            myView.Arrange(new Rect(visualSize));
            myView.UpdateLayout();

            var tgt = new RenderTargetBitmap((int)Width, (int)Height, dpi, dpi, PixelFormats.Pbgra32);

            tgt.Render(canvas);
            var enc = new JpegBitmapEncoder();

            enc.QualityLevel = 80;
            enc.Frames.Add(BitmapFrame.Create(tgt));
            var sfd = new SaveFileDialog();

            if (sfd.ShowDialog() == DialogResult.OK)
            {
                using (var stream = sfd.OpenFile()) {
                    enc.Save(stream);
                }
            }
        }