public void drawRoundRect(Graphics g, Pen p, Rectangle rect, float radius)
{
GraphicsPath gp = new GraphicsPath();
float x = rect.X;
float y = rect.Y;
float width = rect.Width;
float height = rect.Height;
g.SmoothingMode = SmoothingMode.HighQuality;
gp.AddLine(x + radius, y, x + width - (radius * 2), y); // Line
gp.AddArc(x + width - (radius * 2), y, radius * 2, radius * 2, 270, 90); // Corner
gp.AddLine(x + width, y + radius, x + width, y + height - (radius * 2)); // Line
gp.AddArc(x + width - (radius * 2), y + height - (radius * 2), radius * 2, radius * 2, 0, 90); // Corner
gp.AddLine(x + width - (radius * 2), y + height, x + radius, y + height); // Line
gp.AddArc(x, y + height - (radius * 2), radius * 2, radius * 2, 90, 90); // Corner
gp.AddLine(x, y + height - (radius * 2), x, y + radius); // Line
gp.AddArc(x, y, radius * 2, radius * 2, 180, 90); // Corner
gp.CloseFigure();
g.DrawPath(p, gp);
gp.Dispose();
}