BKI_DichVuMatDat.NghiepVu.f300_chinh_lns_nhan_vien.get_option_filter C# (CSharp) Méthode

        private string get_option_filter()
        {
            if(radioButton1.Checked == true)
            {
                return "TAT_CA";
            }
            return "MOI_NHAT";
        }