private readonly Helper _hl;
      public CategoryController(IDataManager dataManager)
        {
            _dataManager = dataManager.GetDataManager();
            _hl = new Helper(_dataManager);
        }

public ActionResult Index()
        {
            var townItem = _hl.GetTownItem(HttpContext.Request);

            ViewBag.TownId = townItem.Name;
           return View();
        }

public Towns GetTownItem(HttpRequestBase request)
        {
            var url = request.Headers["HOST"];
            var split = url.Split('.');
            var index = 0;
            if (split[0].ToLower() == "www")
                index = 1;
            return _dataManager.Towns.GetTown(split[index]) ?? _dataManager.Towns.GetTown(_defaultTownLink);
        }

class Town : IHttpModule
    {
        public void Init(HttpApplication context)
        {
            context.PreRequestHandlerExecute += context_PreRequestHandlerExecute;
        }

        void context_PreRequestHandlerExecute(object sender, EventArgs e)
        {
            var app = (HttpApplication)sender;
            var request = app.Context.Request;

            TownInfo.TownFromUrl = request.Url.Host;
        }

        public void Dispose()
        {
        }
    }
    public static class TownInfo
    {
        private static string _host;

        public static string TownFromUrl
        {
            set
            {
                if (string.IsNullOrWhiteSpace(_host))
                    _host = value.ToLower();
            }
        }

        public static TownModel Town
        {
            get
            {
                var split = _host.Split('.');
                byte index = 0;
                if (split[0] == "www")
                    index = 1;

                return GetTown(split[index]);
            }
        }
        /// <summary>
        /// Возвращает информацию по городу
        /// </summary>
        /// <param name="name"></param>
        /// <returns></returns>
        static TownModel GetTown(string name)
        {
            var listTowns = new List<TownModel>
            {
                new TownModel {Id = 0, Name = "Томск", Link = " tomsk",Address = "адрес томска",CodePhone = "3822",Phone = "тел Томска",Email = "мыло Тск"},
                new TownModel {Id = 2, Name = "Новосибирск", Link = "novosibirsk",Address = "адрес Нск",CodePhone = "383",Phone = "тел Нск",Email = " мыло Нск"}
            };
            var item = listTowns.SingleOrDefault(x => x.Link.Equals(name));
            return item ?? listTowns.SingleOrDefault(x => x.Id == 0);
        } 
    }

public ActionResult Index()
        {

            ViewBag.Town = HelperGlobal.TownInfo.Town.Name;
            return View();
        }