GroupingEventArgsOldColumn - свойство

[CanBeNullAttribute]
public IViewColumnMetadata OldColumn { get; }

<CanBeNullAttribute>
Public ReadOnly Property OldColumn As IViewColumnMetadata
	Get

public:
[CanBeNullAttribute]
property IViewColumnMetadata^ OldColumn {
	IViewColumnMetadata^ get ();
}

[<CanBeNullAttribute>]
member OldColumn : IViewColumnMetadata with get