partial void Deleteborrower(borrower instance);
partial void Updateborrower(borrower instance);
private void detach_borrowers(borrower entity)
{
this.SendPropertyChanging();
entity.book = null;
}
partial void Insertborrower(borrower instance);
private void attach_borrowers(borrower entity)
{
this.SendPropertyChanging();
entity.book = this;
}