The Pen create by this pattern is not same as DashPen which DashStyle is DashStyle.Dash. the PatternPen would always draw solid three pixel and one pixel space.
Using this style to paint a rectangle, polygon, polyline, it will be lost some pixels at each the corner.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2