好了,自己解决了。不知道的朋友网上可以找的到
private void button1_Click(object sender, EventArgs e)
        {
           Image source = new Bitmap(@"e:\bj1.jpg");
           Image a = new Bitmap(@"e:\1.gif");
           Image b = new Bitmap(@"e:\2.gif");
          
            Graphics g = this.CreateGraphics();
            
            g.DrawImage(source, new Point(0, 0));
            g.DrawImage(a, new Point(200, 30));
            for (int i = 0; i < 1000; i++)
            {
                g.DrawImage(b, new Point(i, i));
            }
            g.Dispose();  
        }