public void ChangeEmployerTradeDate(int EmployerID)
    {
        if (EmployerID == 0)
        {
            return;
        }
        Employer employer = Employer.Find(this.iSabayaContext, EmployerID);

        if (employer != null)
        {
            Session["SessionEmployer"] = employer;
            IList <ProvidentFund> IsNotMasterFundLists = new List <ProvidentFund>();
            foreach (ProvidentFund item in employer.GetFundsOn(DateTime.Today))
            {
                if (item.IsMasterFund != true)
                {
                    IsNotMasterFundLists.Add(item);
                }
            }

            ProvidentFund EmpMasterFund = employer.GetMainFundOn(DateTime.Today);
            IList <InstrumentTransactionType> fundTransactionCalendars = new List <InstrumentTransactionType>();
            if (EmpMasterFund != null)
            {
                fundTransactionCalendars = EmpMasterFund.InstrumentTransactionTypes;
            }
            if (fundTransactionCalendars.Count <= 0)
            {
                foreach (ProvidentFund item in IsNotMasterFundLists)
                {
                    if (item.InstrumentTransactionTypes.Count > 0)
                    {
                        fundTransactionCalendars = item.InstrumentTransactionTypes;
                    }
                }
            }

            DateTime tradeDate = TimeInterval.MinDate;
            DateTime effectiveDate;
            DateTime settlementDate;
            //TimeSchedule schedule = fundTransactionCalendars[0].TradeCalendar;
            for (int i = 0; i < fundTransactionCalendars.Count; i++)
            {
                if (fundTransactionCalendars[i].InvestmentTransactionType.Code == PFConstants.PFTTCodeContFileImport)
                {
                    Session["SessionScheduleId"] = fundTransactionCalendars[i].TradeCalendar;
                    fundTransactionCalendars[i].FindTransactionDates(iSabayaContext, DateTime.Now,
                                                                     out tradeDate, out effectiveDate, out settlementDate);
                    break;
                }
            }

            if (tradeDate == TimeInterval.MinDate)
            {
                Session["SessionTradeDate"]  = null;
                Session["SessionScheduleId"] = null;
            }
            else
            {
                Session["SessionTradeDate"] = tradeDate;
            }
        }
        else
        {
            Session["SessionEmployer"]   = null;
            Session["SessionScheduleId"] = null;
            Session["SessionTradeDate"]  = null;
        }
    }