private void detach_BookAuthors(BookAuthor entity)
		{
			this.SendPropertyChanging();
			entity.Book = null;
		}
		private void attach_BookAuthors(BookAuthor entity)
		{
			this.SendPropertyChanging();
			entity.Book = this;
		}
 partial void UpdateBookAuthor(BookAuthor instance);
 partial void DeleteBookAuthor(BookAuthor instance);
 partial void InsertBookAuthor(BookAuthor instance);