public string IspisiAutomobil()
 {
     return("Automobil je marke: " + Marka.ToString() + Environment.NewLine +
            "Model: " + Model.ToString() + Environment.NewLine +
            "Godiste: " + God_proizvodnje.ToString() + Environment.NewLine +
            "Pogon: " + Pogon.ToString() + Environment.NewLine +
            "Menjac: " + Menjac.ToString() + Environment.NewLine +
            "Karoserija: " + Karoserija.ToString() + Environment.NewLine +
            "Gorivo: " + Gorivo.ToString() + Environment.NewLine +
            "Broj vrata: " + Broj_vrata.ToString());
 }
 public string UpisUFajl()
 {
     return(Marka.ToString() + "," + Model.ToString() + "," + Kubikaza.ToString() + "," + God_proizvodnje.ToString() + "," + Pogon.ToString() + "," + Menjac.ToString() + "," + Karoserija.ToString() + "," + Gorivo.ToString() + "," + Broj_vrata.ToString() + "," + id.ToString());
 }