private void AuthenticateUser(string email)
        {
            var result = authenticateUserValidation.Validate(new User {
                Email = email
            });

            if (result.IsValid)
            {
                principalHelper.SetAuthenticatedUser(userRepository.Get(email));
                Console.WriteLine("Authentication successful");
            }
            else
            {
                Console.WriteLine(result.Exception.Message);
            }
        }