Скриншот элемента формы

[tehadm]

using System.Drawing.Imaging;

Bitmap bitmap = new Bitmap(videoView1.Width, videoView1.Height);

            using (Graphics gr = Graphics.FromImage(bitmap))
            {
                gr.CopyFromScreen(videoView1.PointToScreen(Point.Empty), Point.Empty, videoView1.Size);
            }

            bitmap.Save("screenshot.png", ImageFormat.Png);