public void EditFeedback(FeedbackViewModel feedback) { Feedback feedbacks = _feedbackRepository.GetById(feedback.Id); if (feedbacks == null) { throw new Exception($"Feedback with id {feedback.Id} was not found"); } List <Feedback> feedbackss = _feedbackRepository.GetAll().Where(x => x.Email == (FeedbackMapper.ToFeedback(feedback)).Email).ToList(); if (feedbackss.Count == 3) { throw new Exception("Can't post anymore feedbacks you have already posted three"); } Regex regex = new Regex(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$"); Match match = regex.Match(feedback.Email); if (!match.Success) { throw new Exception("Email is not in correct format"); } Feedback editFeedback = FeedbackMapper.ToFeedback(feedback); editFeedback.Id = feedback.Id; _feedbackRepository.Update(editFeedback); }