cut a piece of a picture in c#

public static Bitmap Extract(Bitmap src, Rectangle section)
    {
    Bitmap bmp = new Bitmap(section.Width, section.Height);
    using (Graphics g = Graphics.FromImage(bmp))
        {
        g.DrawImage(src, 0, 0, section, GraphicsUnit.Pixel);
        }
    return bmp;
    }