partial void DeleteStudent_Class(Student_Class instance);
partial void UpdateStudent_Class(Student_Class instance);
private void detach_Student_Class(Student_Class entity)
{
this.SendPropertyChanging();
entity.ClassInfo = null;
}
partial void InsertStudent_Class(Student_Class instance);
private void attach_Student_Class(Student_Class entity)
{
this.SendPropertyChanging();
entity.Student = this;
}