static void Main(string[] args)
        {
            Console.WriteLine((NasJmennyProstor.MojeKonzolovka.NajetyPrumer()).ToString());
            switch (args.Length)
            {
                case 0: Console.WriteLine("malo parametru");
                    break;
                case 1:
                    NasJmennyProstor.MojeKonzolovka MujObjektJP = new NasJmennyProstor.MojeKonzolovka(args[0]);
                    break;
                case 2:
                    NasJmennyProstor.MojeKonzolovka MujObjektDP = new NasJmennyProstor.MojeKonzolovka(args[0], args[1]);
                    break;
                default:
                    Console.WriteLine("prilis mnoho parametru");
                    break;
            }
        }
---------------------------------------------------------------
namespace NasJmennyProstor
{
    class MojeKonzolovka
    {
        public static double NajetyPrumer()
        {
            StreamReader nacitacNajeto = new StreamReader("najeto.txt");
            double Soucet = 0;
            int Pocet = 0;
            while (!nacitacNajeto.EndOfStream)
            {
                Soucet += Double.Parse(nacitacNajeto.ReadLine());
                Pocet++;
            }
            return Soucet / Pocet;
        }
    }
}