public ActionResult SaveEmployee(Employee employeeEdited, string returnUrl)
        {
            var employee = Employees.FirstOrDefault(x => x.EmployeeId == employeeEdited.EmployeeId);

            if (employee != null)
            {
                employee.FirstName = employeeEdited.FirstName;
                employee.LastName = employeeEdited.LastName;
            }
            else
            {
                employeeEdited.EmployeeId = Employees.Count() + 1;
                _employees.Add(employeeEdited);
            }

            return Redirect(returnUrl);
        }