Line draw in WinForms

paint-line.cs

// paint handler
private void fForm_Paint(object sender, PaintEventArgs e)
        {
            Pen redPen = new Pen(Color.Red, 1.0F);
            PointF p1 = new PointF(20.0F, 50.0F);
            PointF p2 = new PointF(200.0F, 50.0F);
            e.Graphics.DrawLine(redPen, p1, p2);
        }