public Dictionary <string, string> GetEmployeeIds()
        {
            Dictionary <string, string> employeeIds = new Dictionary <string, string>();

            List <ISalesman>   salesmans   = _salesmanService.GetAllSalesmans();
            List <IAccountant> accountants = _accountantService.GetAllAccountants();

            foreach (var salesman in salesmans)
            {
                employeeIds.Add(salesman.SalesmanId, "Salesman");
            }

            foreach (var accountant in accountants)
            {
                employeeIds.Add(accountant.AccountantId, "Accountant");
            }

            return(employeeIds);
        }