[DllImport("gdi32.dll")]
[PreserveSig()]
public static CombineRgnResult CombineRgn( 
   IntPtr hrgnDest,
   IntPtr hrgnSrc1,
   IntPtr hrgnSrc2,
   RGN fnCombineMode
)

Parameters

hrgnDest

hrgnSrc1

hrgnSrc2

fnCombineMode

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

Reference

NativeMethods Class
NativeMethods Members