'Declaration Public ReadOnly Property Guid As Nullable(Of Guid)
public Nullable<Guid> Guid {get;}
Note: this property is optional but if one group contains a guid then all groups in the collection nust also have guids generated for them.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, 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