'Declaration
Public MustInherit Class C1HierarchicalDataCollection(Of T As Class) Implements IDataCollection(Of T), ISupportAsyncLoading(Of T), ISupportEditing(Of T), ISupportIncrementalLoading, ISupportIndexing(Of T), ISupportRangeEditing(Of T), ISupportSorting, ISupportVirtualization
public abstract class C1HierarchicalDataCollection<T> : IDataCollection<T>, ISupportAsyncLoading<T>, ISupportEditing<T>, ISupportIncrementalLoading, ISupportIndexing<T>, ISupportRangeEditing<T>, ISupportSorting, ISupportVirtualization where T: class