Async variant of SaveMulti. Saves all new/dirty Entities in the IEntityCollection in the persistent storage. If this IEntityCollection is added to a transaction, the save processes will be done in that transaction, if the entity isn't already added to another transaction. If the entity is already in another transaction, it will use that transaction. If no transaction is present, the saves are done in a new Transaction (which is created in an inherited method.). Will not recursively save entities inside the collection.

Task<int> SaveMultiAsync()

Function SaveMultiAsync As Task(Of Integer)