void Them(HocPhan s) { ds.Add(s); }
public string Xuat(HocPhan hp) { this.hp = hp; return(string.Format("{0}|{1}|{2}|{3}|{4}|{5}|{6}", CanhLe(maSV, 10), CanhLe(MaMH, 10), CanhLe(hp.TenHP, 15), hp.soTC, hp.lT, hp.tH, diem)); }