private void detach_BookQuantities(BookQuantity entity)
		{
			this.SendPropertyChanging();
			entity.Book = null;
		}
		private void attach_BookQuantities(BookQuantity entity)
		{
			this.SendPropertyChanging();
			entity.Book = this;
		}
 partial void UpdateBookQuantity(BookQuantity instance);
 partial void DeleteBookQuantity(BookQuantity instance);
 partial void InsertBookQuantity(BookQuantity instance);