public async Task SendArticleEmail(Article article, AspNetUser user, string subject)
        {
            string body    = article.Article_text;
            var    addLink = new connection_user_article {
                ArticleId = article.ArticleId, AspNetUserId = user.Id
            };

            _unitOfWork.ArticleRepository.AddConnection(addLink);
            await _senderService.SendMessage(user.Email, subject, body);

            await _unitOfWork.SaveChangesAsync();
        }
 public void AddConnection(connection_user_article connection)
 {
     DbContext.connection_user_article.Add(connection);
 }