Описание тега icollectionview
An interface that enables collections to have the functionalities of current record management, custom sorting, filtering, and grouping.
The ICollectionView Interface, available in.NET 3+, enables collections to have the functionalities of current record management, custom sorting, filtering, and grouping.
http://msdn.microsoft.com/en-us/library/system.componentmodel.icollectionview.aspx