private void detach_BooksLoaneds(BooksLoaned entity)
 {
     this.SendPropertyChanging();
     entity.Book = null;
 }
 private void attach_BooksLoaneds(BooksLoaned entity)
 {
     this.SendPropertyChanging();
     entity.Book = this;
 }
 partial void UpdateBooksLoaned(BooksLoaned instance);
 partial void DeleteBooksLoaned(BooksLoaned instance);
 partial void InsertBooksLoaned(BooksLoaned instance);