Draw round corner rectangle (See related posts)

        public void DrawRoundRect(Graphics g, Pen p, float X, float Y, float width, float height, float radius)
        {
            GraphicsPath gp = new GraphicsPath();

            gp.AddLine(X + radius, Y, X + width - (radius * 2), Y);
            gp.AddArc(X + width - (radius * 2), Y, radius * 2, radius * 2, 270, 90);
            gp.AddLine(X + width, Y + radius, X + width, Y + height - (radius * 2));
            gp.AddArc(X + width - (radius * 2), Y + height - (radius * 2), radius * 2, radius * 2, 0, 90);
            gp.AddLine(X + width - (radius * 2), Y + height, X + radius, Y + height);
            gp.AddArc(X, Y + height - (radius * 2), radius * 2, radius * 2, 90, 90);
            gp.AddLine(X, Y + height - (radius * 2), X, Y + radius);
            gp.AddArc(X, Y, radius * 2, radius * 2, 180, 90);
            gp.CloseFigure();

            g.DrawPath(p, gp);
            gp.Dispose();
        }