Filled Squere

private void Form1_Paint(object sender, PaintEventArgs e)
{
    Graphics g = e.Graphics;
    // Create pen.
    Pen blackPen = new Pen(Color.Black, 3);
    // Create points that define polygon.
    Point point1 = new Point(30, 50);
    Point point2 = new Point(100, 25);
    Point point3 = new Point(200, 5);
    Point point4 = new Point(250, 50);
    Point point5 = new Point(270, 100);
    Point point6 = new Point(250, 250);
    Point[] curvePoints = {point1, point2, point3, point4, point5, point6};
    // Draw polygon to screen.
    g.DrawPolygon(blackPen, curvePoints);
    // Fill polygon
    g.FillPolygon(Brushes.Red, curvePoints);
}