void DrawImageIntersectClip(Graphics g)
{
// Create the first rectangle and draw it to the screen in black.
Rectangle regionRect = new Rectangle(20, 20, 100, 100);
g.DrawRectangle(Pens.Black, regionRect);
// create the second rectangle and draw it to the screen in red.
RectangleF complementRect = new RectangleF(90, 30, 100, 100);
g.DrawRectangle(Pens.Red,
Rectangle.Round(complementRect));
// Create a region using the first rectangle.
Region myRegion = new Region(regionRect);
// Get the area of intersection for myRegion when combined with
// complementRect.
myRegion.Intersect(complementRect);
var unionRect = complementRect.UnionWith (regionRect);
g.DrawRectangle(Pens.Green,
Rectangle.Round(unionRect));
g.Clip = myRegion;
g.DrawImage(bmp2, unionRect);
title = "DrawImageIntersetClip";
}