public void HuyLuotDangKi() { SinhVien.ThongBaoHoatDong(ThongBaoHoatDong.TaoThongBaoHuyDangKi(HoatDong)); }
public void Xoa() { SinhVien.ThongBaoHoatDong(ThongBaoHoatDong.TaoThongBaoHuyDiemDanh(HoatDong)); HoatDong.XoaLuotThamGia(); }