Async variant of DeleteEntityCollection(IEntityCollection2). Deletes all dirty objects inside the collection passed from the persistent storage. It will do this inside a transaction if a transaction is not yet available. Entities which are physically deleted from the persistent storage are marked with the state 'Deleted' but are not removed from the collection.

Task<int> DeleteEntityCollectionAsync(
	IEntityCollection2 collectionToDelete,
	CancellationToken cancellationToken
)

Function DeleteEntityCollectionAsync ( 
	collectionToDelete As IEntityCollection2,
	cancellationToken As CancellationToken
) As Task(Of Integer)