FillPolygon problem?

[r9]

I have a figure that I want to fill with black color, but it don't work!! private void button11_Click(object sender, System.EventArgs e) { System.Drawing.Graphics formGraphics = null; System.Drawing.Pen myPen; formGraphics = pictureBox7.CreateGraphics(); myPen = new System.Drawing.Pen(System.Drawing.Color.Black,1); formGraphics.DrawLine(myPen, 4, 4, 50, 4); formGraphics.DrawLine(myPen, 4, 4, 4, 100); formGraphics.DrawLine(myPen, 50, 4, 50, 100); formGraphics.DrawLine(myPen, 4, 100, 27, 120); formGraphics.DrawLine(myPen, 50, 100, 27, 120); SolidBrush Brush = new SolidBrush(Color.Black); Point point1 = new Point(4, 4); Point point2 = new Point(50, 4); Point point3 = new Point(4, 4); Point point4 = new Point(4, 100); Point point5 = new Point(50, 4); Point point6 = new Point(50, 100); Point point7 = new Point(4, 100); Point point8 = new Point(27, 120); Point point9 = new Point(50, 100); Point point10 = new Point(27, 120); Point[] curvePoints = new Point[] { point1, point2, point3, point4, point5, point6, point7, point8, point9, point10, }; formGraphics.FillPolygon(Brush, curvePoints); myPen.Dispose(); formGraphics.Dispose(); } Any idea?