private void detach_Accounts(Account entity)
 {
     this.SendPropertyChanging();
     entity.Bank = null;
 }
 private void attach_Accounts(Account entity)
 {
     this.SendPropertyChanging();
     entity.Bank = this;
 }
 partial void UpdateAccount(Account instance);
 partial void DeleteAccount(Account instance);
 partial void InsertAccount(Account instance);