public IActionResult AdminIndex(int?page)
        {
            var audio = dbContext.Explanations
                        .Select(x => new Explain {
                Title = x.Title, BookName = x.BookName, ID = x.ID, Date = x.Date
            })
                        .ToList();
            var pager = new Pager(audio.Count(), page);

            explainView = new ExplanationViewModel()
            {
                Explains  = audio.Skip((pager.CurrentPage - 1) * pager.PageSize).Take(pager.PageSize),
                PagerView = pager
            };
            return(View(explainView));
        }
        // GET: /<controller>/
        public IActionResult Index()
        {
            explanation = new ExplanationViewModel()
            {
                Explains = dbContext.Explanations
                           .Select(x => new Explain {
                    Title = x.Title, BookName = x.BookName, ID = x.ID, Date = x.Date
                })
                           .Take(5)
                           .ToList()
            };

            writing = new WritingViewModel()
            {
                Books = dbContext.Writings
                        .Select(x => new Book {
                    ID = x.ID, Category = x.Category, Title = x.Title
                })
                        .Take(5)
                        .ToList()
            };

            lecture = new LectureViewModel()
            {
                Audios = dbContext.Lectures
                         .Select(x => new Audio {
                    ID = x.ID, Title = x.Title, Date = x.Date
                })
                         .Take(5)
                         .ToList()
            };

            article = new ArticleViewModel()
            {
                Articles = dbContext.Articles.Take(5).ToList()
            };

            homeView = new HomeViewModel()
            {
                ExplanationViews = explanation,
                WritingViews     = writing,
                LectureViews     = lecture,
                ArticleViews     = article
            };

            return(View(homeView));
        }