public GIAOVIEN get_unique(int id)
{
DataTable dt = dao_GiaoVien.get_unique(id);
int countrows = dt.Rows.Count;
if (countrows <= 0)
{
return(null); //data chưa có dòng nào, return
}
DataRow row = dt.Rows[0];
return(new GIAOVIEN()
{
maNguoiDung = (row["maNguoiDung"] == DBNull.Value) ? (-1) : (int)row["maNguoiDung"],
monDay = (row["monDay"] == DBNull.Value) ? (-1) : (int)row["monDay"],
});
}