public void Insert(Article article)
        {
            var currentUser = System.Threading.Thread.CurrentPrincipal.Identity.Name;
            article.PublishedBy = currentUser;
            article.PublishedDate = DateTime.UtcNow;
            Articles.Add(article);

            SaveChanges();
        }
        public void Publish(Article article)
        {
            _articleContext.Insert(article);

            Clients.All.published(article);
        }