static void Main()

    {

    List<int> list = new List<int>();

    list.Add();

    list.Add();

    list.Add();

    List<int>.Enumerator e = list.GetEnumerator();

    Write(e);

    }

    static void Write(IEnumerator<int> e)

    {

    while (e.MoveNext())

    {

        int value = e.Current;

        Console.WriteLine(value);

    }

    }