绘制边框

base.OnPaint(e);
Graphics g = e.Graphics;
Rectangle myRectangle = new Rectangle(0, 0, Width, Height);
//绘制边框
ControlPaint.DrawBorder(e.Graphics, myRectangle,
Color.FromArgb(230, 230, 230), 2, ButtonBorderStyle.Solid,
Color.FromArgb(230, 230, 230), 1, ButtonBorderStyle.Solid,
Color.FromArgb(230, 230, 230), 3, ButtonBorderStyle.Solid,
Color.FromArgb(230, 230, 230), 1, ButtonBorderStyle.Solid
);