void WczytajListy()
        {

            int ilosclist = 0;
            foreach(string file in Directory.EnumerateFiles(Application.StartupPath+"/listy","*.lista"))
            {
                StreamReader sr = new StreamReader(file);
                int ilosc = Convert.ToInt16(sr.ReadLine());
                string nazwa = sr.ReadLine();
                int numer = Convert.ToInt32(sr.ReadLine());
                sr.Close();
                Lista list = new Lista(nazwa, numer);
                zbiorlist.Add(list);
                WczytajProdukty(list);
                ilosclist++;
            }

        }