private void ConcatHouseData(IHousingSiteHandler siteHandler)
 {
     foreach (HouseData house in siteHandler.houseData)
     {
         houseData.Add(house);
     }
 }
        private void Run(int site)
        {
            Console.WriteLine("Handling site " + site + "(" + housingSites.Keys.ElementAt(site) + ")");
            IHousingSiteHandler currentHousingSiteHandler = housingSites.Values.ElementAt(site);

            currentHousingSiteHandler.SetParams(city, priceMin, priceMax, area, bedrooms);
            currentHousingSiteHandler.ParsePage();
            ConcatHouseData(currentHousingSiteHandler);
        }