public ActionResult Index(int page = 1)
        {
            int pageSize = 5; // количество объектов на страницу

            if (User.Identity.IsAuthenticated)
            {
                ViewBag.Us = User.Identity.IsAuthenticated;
                using (CommonContext db = new CommonContext())
                {
                    var model = db.Ads.ToList();
                    model.Reverse();
                    IEnumerable<Ad> adsPerPages = model.Skip((page - 1) * pageSize).Take(pageSize);
                    PageInfo pageInfo = new PageInfo { PageNumber = page, PageSize = pageSize, TotalItems = model.Count };
                    IndexViewModel ivm = new IndexViewModel { PageInfo = pageInfo, Ads = adsPerPages };
                    ViewBag.IsUnread = IsUnread();
                    return View(ivm);
                }   
            }

            return View("Guest");
            
        }
        public ActionResult preSearch(string Keywords, int page = 1)
        {
            ViewBag.Keywords = Keywords;

            using (CommonContext db = new CommonContext())
            {
                List<Ad> sortedModel = new List<Ad>();
                List<Ad> model;
                model = (from items in db.Ads select items).ToList();

                if (Keywords != "")
                {
                    if (model.Count != 0)
                    {
                        string[] keys = Keywords.Split(',');
                        for (int i = 0; i < keys.Length; i++)
                        {
                            string key = keys[i].Trim();
                            foreach (var m in model)
                            {
                                if (m.Keywords != null)
                                {
                                    if (m.Keywords.Contains(key))
                                    {
                                        sortedModel.Add(m);
                                    }

                                }
                            }
                        }
                    }
                }
                else
                    sortedModel = model;
                
                int pageSize = 2;
                IEnumerable<Ad> adsPerPages = model.Skip((page - 1) * pageSize).Take(pageSize);
                PageInfo pageInfo = new PageInfo { PageNumber = page, PageSize = pageSize, TotalItems = model.Count };
                IndexViewModel ivm = new IndexViewModel { PageInfo = pageInfo, Ads = sortedModel };
                ViewBag.IsUnread = IsUnread();
                return View("Search", ivm);
            }
        }
        public ActionResult Search(string Keywords, string Theme, string Location, string Popularity, int page = 1)
        {
            //this.TempData["Keywords"] = Keywords;
            ViewBag.Keywords = Keywords;
            ViewBag.Theme = Theme;
            //ViewBag.Location = Location;
            ViewBag.Popularity = Popularity;

            using (CommonContext db = new CommonContext())
            {
                List<Ad> sortedModel = new List<Ad>();
                List<Ad> model;
                if (Theme != "Усі теми")
                    model = (from items in db.Ads where items.Theme == Theme select items).ToList();
                else
                    model = (from items in db.Ads select items).ToList();
                if (Location != "Україна")
                    model = (from items in model where items.Country == Location select items).ToList();
                else
                    model = (from items in model select items).ToList();


                if (Keywords != "")
                {
                    if (model.Count != 0)
                    {
                        string[] keys = Keywords.Split(',');
                        for (int i = 0; i < keys.Length; i++)
                        {
                            string key = keys[i].Trim();
                            foreach (var m in model)
                            {
                                if (m.Keywords != null)
                                {
                                    if (m.Keywords.Contains(key))
                                    {
                                        sortedModel.Add(m);
                                    }

                                }
                            }
                        }
                    }
                }
                else
                    sortedModel = model;

                if (Popularity == "on")
                {
                    List<Ad> helper = (from item in sortedModel
                                       orderby item.Views descending
                                       select item).ToList<Ad>();
                    sortedModel = helper;
                }

                int pageSize = 2;
                IEnumerable<Ad> adsPerPages = model.Skip((page - 1) * pageSize).Take(pageSize);
                PageInfo pageInfo = new PageInfo { PageNumber = page, PageSize = pageSize, TotalItems = model.Count };
                IndexViewModel ivm = new IndexViewModel { PageInfo = pageInfo, Ads = sortedModel };

                //sortedModel.Reverse();
                ViewBag.IsUnread = IsUnread();
                return View(ivm);
            }
        }