大家好!!我是一新手!!请大家多多关照!

我在窗体上画了一个多边形,想确定在鼠标点击窗体的时候,鼠标点击的那点是否在所画的多边形内,这个要怎么做啊!!请大家多多帮忙!!

 Graphics g = this.CreateGraphics();
            Pen p = new Pen(Color.Red);
            Point p1 = new Point(5,285);
            Point p2 = new Point(269,183);
            Point p3 = new Point(398,292);
            Point p4 = new Point(815,362);
            Point p5 = new Point(814,578);
            Point p6 = new Point(261,578);
            Point p7 = new Point(2,404);
            Point[] pa ={ p1, p2, p3, p4, p5, p6, p7 };
            g.DrawPolygon(p,pa);