public Article AddArticle(Article toAdd)
        {
            toAdd.PostedOn = DateTime.UtcNow;
            this.articles.SaveChanges();

            return toAdd;
        }
        public IQueryable<Article> UpdateArticle(Article update)
        {
            update.PostedOn = DateTime.UtcNow;
            this.articles.Update(update);
            this.articles.SaveChanges();

            return this.articles.All().Where(a => a.Id == update.Id);
        }