internal ProducentsDAO()
        {
            list = new List <IProducent>();
            Producent producent1 = new Producent("Stock Polska Sp. z o.o.", "Spółdzielcza 6, 20-402 Lublin");
            Producent producent2 = new Producent("CEDC International sp. z o.o.", "Kowanowska 48, 64-600, Oborniki Wlkp.");
            Producent producent3 = new Producent("V&S VIN & SPRIT", "Årstaängsvägen 19a, 117 97,  Stockholm", Country.Sweden);

            list.Add(producent1);
            list.Add(producent2);
            list.Add(producent3);
        }
        internal ProducentsDAO()
        {
            list = new List <IProducent>();
            Producent producent1 = new Producent("Russkij Standard",
                                                 "World Trade Center, Office 1503a Krasnopresnenskaya Emb., 12, 123610 Moscow",
                                                 Country.Russia
                                                 );
            Producent producent2 = new Producent("Sobieski Trade Sp. z o.o.", "Kołaczkowo 9, 62-230 Witkowo");
            Producent producent3 = new Producent("Pernod Ricard", "Złota 59, 00-120 Warszawa");

            list.Add(producent1);
            list.Add(producent2);
            list.Add(producent3);
        }