Hi guys, Why in this example (got from msdn), in GetEnumerator method , PeopleEnum returns IEnumerator? public class Person { public Person(string fName, string lName) { this.firstName = fName; this.lastName = lName; }

    public string firstName;
    public string lastName;
}

public class People : IEnumerable
{
    private Person[] _people;
    public People(Person[] pArray)
    {
        _people = new Person[pArray.Length];

        for (int i = 0; i < pArray.Length; i++)
        {
            _people[i] = pArray[i];
        }
    }
   //why??? 
   IEnumerator IEnumerable.GetEnumerator()
   {
       return (IEnumerator) GetEnumerator();
   }

   public PeopleEnum GetEnumerator()
   {
       return new PeopleEnum(_people);
   }

}

public class PeopleEnum : IEnumerator { public Person[] _people;

// Enumerators are positioned before the first element
// until the first MoveNext() call.
int position = -1;

public PeopleEnum(Person[] list)
{
    _people = list;
}

public bool MoveNext()
{
    position++;
    return (position < _people.Length);
}

public void Reset()
{
    position = -1;
}

object IEnumerator.Current
{
    get
    {
        return Current;
    }
}

public Person Current
{
    get
    {
        try
        {
            return _people[position];
        }
        catch (IndexOutOfRangeException)
        {
            throw new InvalidOperationException();
        }
    }
}

}