public DataTable DanhSachLop_TheoHS(string maHS)
{
HoSoHocSinh hs = new HoSoHocSinh_BUS().LayThongTinHocSinh(maHS);
string query = @"Select * from [dbo].[Lop] where MaLop = @malop";
return(DataProvider.Instance.ExcuteQuery(query, new object[] { hs.MaLop }));
}