public List <lop> searchListLop(String search)
        {
            List <lop> list = new List <lop>();
            String     query;

            query = "Select * from lop where makhoa = '" + search + "' or lop.malop = '" + search + "' or lop.tenlop = '" + search + "'";

            try {
                SqlCommand    cmd    = new SqlCommand(query, getConnection());
                SqlDataReader reader = cmd.ExecuteReader();
                while (reader.Read())
                {
                    lop l = new lop();
                    l.lopIDataReader(reader);
                    list.Add(l);
                }
                reader.Close();
            } catch (Exception e) {
            }
            return(list);
        }
        public List <lop> getListLop()
        {
            List <lop> list = new List <lop>();
            String     query;

            query = "Select * from lop ";

            try
            {
                SqlCommand    cmd    = new SqlCommand(query, getConnection());
                SqlDataReader reader = cmd.ExecuteReader();
                while (reader.Read())
                {
                    lop l = new lop();
                    l.lopIDataReader(reader);
                    list.Add(l);
                }
                reader.Close();
            }
            catch (Exception e)
            {
            }
            return(list);
        }