public void AddEmployee(EmployeeViewModel e)
 {
     ctx.AddEmployee(e.NationalIDNumber,
                     e.LoginID, e.FirstName,
                     e.LastName,
                     e.JobTitle,
                     e.BirthDate,
                     e.MaritalStatus,
                     e.Gender, e.HireDate,
                     e.SalariedFlag,
                     e.VacationHours,
                     e.SickLeaveHours);
 }