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property X[index: integer]: string read GetX write SetX;                    

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    class ArrayPropClass
    {
        private int maxCount = 100;
        private ArrayList privateArrayData;
        public ArrayPropClass(int maxItemsNum)
        {
            privateArrayData = new ArrayList();
            maxCount = maxItemsNum;
        }

        public int itemsCount
        {
            get { return privateArrayData.Count; }
        }

        public object this[int index]
        {
            get
            {
                if (index < itemsCount) 
                  return (privateArrayData[index]);
                else
                  throw new IndexOutOfRangeException("Maximaler Index bei get überschritten");  
            }
            set
            {
                if (index > maxCount - 1) throw new IndexOutOfRangeException("Maximaler Index bei set überschritten");
                if (index < itemsCount)
                    privateArrayData[index] = value;
                else
                {
                    for (int i = itemsCount; ((i<index)&&!(i<0)); i++)
                    {
                        privateArrayData.Add(null);
                    };
                    privateArrayData.Add(value);
                }
            }
        }
    }