public void LayDuLieuLenComboBox_DK_KTX(ComboBox com, string maktx)
        {
            DayData day = new DayData();

            com.DataSource    = day.LayDSDay_DK_KTX(maktx);
            com.DisplayMember = "TENDAY";
            com.ValueMember   = "MADAY";
        }