C# - Prüfungsauswertung

string msg;
           
            ArrayList results = null;

            try
            {
                results = new ArrayList()
                
                {new Result(444444, 3.0), new Result(555555, 1.0), 
                 new Result(666666, 3.3)};
            }
            catch (Exception e)
            {
                msg = e.Message;
            }

            for (int i = 0; i < results.Count; i++)
            {
                Console.Write("{0}\t", ((Result)results[i]).Matrikel);
                Console.Write("{0,5:f1}\n", ((Result)results[i]).Note);
            }

            double sum = 0, average;
            for (int i = 0; i < results.Count; i++)
                    sum += ((Result)results[i]).Note;
            average = sum / results.Count; 

            Console.WriteLine("\nnumber of participants: {0,5}", results.Count);
            Console.WriteLine("average grade    : {0,5:f2}", average);
        }



class Result
    {
        private int matrikel;
        public int Matrikel
        {
            set 
            { 
                if (value < 100000 | value > 999999)
                    throw new Exception ("Matrikelnummer muss zwischen 100000 und 999999 liegen");
                else matrikel = value;
            }

            get { return matrikel; }
        }
        
        private double note;
        public double Note
        {
            set 
            { 
                if (value < 1.0 | value > 5.0)
                    throw new Exception ("Note muss zwischen 1,0 und 5,0 liegen");
                else note = value;
            }
            get { return note; }
        }

        public Result(int matrikel, double note)
        {
            Matrikel = matrikel;
            Note = note;
        }
    }