'Declaration Public Overloads Sub Add( _ ByVal columnKey As String, _ ByVal sortDir As GroupingSortDirection _ )
public void Add( string columnKey, GroupingSortDirection sortDir )
Target Platforms: Windows 10, Windows 8.1, Windows 8, 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