'Declaration Public Overloads Function Contains( _ ByVal fieldName As String, _ ByVal isGroupBy As Nullable(Of Boolean) _ ) As Boolean
public bool Contains( string fieldName, Nullable<bool> isGroupBy )
Note: the collection can now contain up to 2 instances of FieldSortDescriptions with the same field (one with its IsGroupBy set to true and the other with its IsGroupBy set to false).
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