Vista Tutorial - Save WPF Control as PNG image

        public static ImageSource ToImageSource(FrameworkElement obj)
        {
            // Save current canvas transform
            Transform transform = obj.LayoutTransform;
            obj.LayoutTransform = null;
            
            // fix margin offset as well
            Thickness margin = obj.Margin;
            obj.Margin = new Thickness(0, 0,
                 margin.Right - margin.Left, margin.Bottom - margin.Top);

            // Get the size of canvas
            Size size = new Size(obj.Width, obj.Height);
            
            // force control to Update
            obj.Measure(size);
            obj.Arrange(new Rect(size));

            RenderTargetBitmap bmp = new RenderTargetBitmap(
                (int)obj.Width, (int)obj.Height, 96, 96, PixelFormats.Pbgra32);
            
            bmp.Render(obj);

            // return values as they were before
            obj.LayoutTransform = transform;
            obj.Margin = margin;
            return bmp;
        }