private void detach_BookGenres(BookGenre entity)
		{
			this.SendPropertyChanging();
			entity.Book = null;
		}
		private void attach_BookGenres(BookGenre entity)
		{
			this.SendPropertyChanging();
			entity.Book = this;
		}
 partial void UpdateBookGenre(BookGenre instance);
 partial void DeleteBookGenre(BookGenre instance);
 partial void InsertBookGenre(BookGenre instance);