public EmployeeViewModel GetUserByEmail(string emailAddress)
        {
            var user = _employeeRepository.FindBy(x => x.EmailAddress == emailAddress)
                       .SingleOrDefault();

            if (user == null)
            {
                return(null);
            }

            var employeeViewModel = _autoMapper.Map <EmployeeViewModel>(user);

            return(employeeViewModel);
        }