public void Execute()
        {
            ArrayList employeeIds = PayrollRepository.GetAllEmployeeIds();

            foreach (int eachId in employeeIds)
            {
                Employee e = PayrollRepository.GetEmployee(eachId);
                if (e.IsPayday(_payDate))
                {
                    PayCheck pc = new PayCheck(_payDate);
                    _payChecks[eachId] = pc;
                    e.Payday(pc);
                    pc.PayDate = _payDate;
                }
            }
        }