public ListColumnName(DateTime ThangNam, int ID_NhanVien)
        {
            DateTime start = new DateTime(ThangNam.Year, ThangNam.Month, 1);
            DateTime end   = new DateTime(start.Year, start.Month, 1).AddMonths(1).AddDays(-1);

            lstColumnName = new Dictionary <string, List <double> >();
            string HoVaTen = data.NHANSUs.Find(ID_NhanVien).HoVaTen;
            //item At Work - WFH
            List <double> tmpAtWork = new List <double>();
            List <double> tmpWFH    = new List <double>();

            lstWorkingDaysForStaffOfMonth = data.fnDisplayWorkingDaysStaffOfMonth(HoVaTen, ThangNam).ToList();
            for (int i = 0; i < lstWorkingDaysForStaffOfMonth.Count; i++)
            {
                tmpAtWork.Add((double)(Weekdays(start, end)
                                       - CalculateTotalOFFDayInWeekdays(lstWorkingDaysForStaffOfMonth[i].ID, start, end)
                                       - (lstWorkingDaysForStaffOfMonth[i].WFH.HasValue ? lstWorkingDaysForStaffOfMonth[i].WFH.Value : 0)));
                tmpWFH.Add((double)((lstWorkingDaysForStaffOfMonth[i].WFH.HasValue ? lstWorkingDaysForStaffOfMonth[i].WFH.Value : 0)));
            }
            lstColumnName.Add("At_Work", tmpAtWork);
            lstColumnName.Add("WFH", tmpWFH);

            //them toan bo PC vao list
            foreach (var item in data.PHUCAPs.ToList())
            {
                List <fnGetAmountBenefit_Result> tmpBenefit = data.fnGetAmountBenefit(HoVaTen, start, item.ID, end).ToList();
                List <double> tmpAmountBenefit = new List <double>();
                foreach (var item1 in tmpBenefit)
                {
                    tmpAmountBenefit.Add(Decimal.ToDouble((decimal)(item1.PC_CoDinh.HasValue ? item1.PC_CoDinh.Value : 0)));
                }
                lstColumnName.Add(item.TenPhuCap.Replace(" ", ""), tmpAmountBenefit);
            }
        }