public ActionResult ArticleDetails(Guid?id) { IArticleBLL articleBLL = new ArticleBLL(); if (id == null || !articleBLL.ExistArticle(id.Value)) { return(RedirectToAction(nameof(ArticleList))); } ViewBag.Comments = articleBLL.GetCommentsByArticleId(id.Value); return(View(articleBLL.GetOneArticleById(id.Value))); }