private void detach_registration_ts(registration_t entity)
{
this.SendPropertyChanging();
entity.subject_t = null;
}
private void attach_registration_ts(registration_t entity)
{
this.SendPropertyChanging();
entity.student_t = this;
}
partial void Updateregistration_t(registration_t instance);
partial void Deleteregistration_t(registration_t instance);
partial void Insertregistration_t(registration_t instance);