switch(BorderStyle)
{
case BorderStyle.None:
break ;
case BorderStyle.FixedSingle:
System.Windows.Forms.ControlPaint.DrawBorder3D(e.Graphics,e.ClipRectangle,Border3DStyle.Flat) ;
break ;
case BorderStyle.Fixed3D:
System.Windows.Forms.ControlPaint.DrawBorder3D(e.Graphics,e.ClipRectangle,Border3DStyle.Sunken) ;
break ;