How do you copy from a rectangular source region to a non-rectangular/non-paralellogram destination region in .NET?

using (Graphic g = this.CreateGraphics())
{
    List<Point> pts = new List<Point>();
    pts.Add(new Point(0, 0));
    pts.Add(new Point(100, 0));
    pts.Add(new Point(10, 100));
    g.DrawImage(pbSource.Image, pts.ToArray());
}