Interface IEnumerable, C#

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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    using System;
using System.Collections;

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];
        }
    }

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();
            }
        }
    }
}

public class Program
    {
        public static void Main(string[] args)
        {
                    Person[] peopleArray = new Person[3]
        {
            new Person("John", "Smith"),
            new Person("Jim", "Johnson"),
            new Person("Sue", "Rabon"),
        };

People peopleList = new People(peopleArray);
        foreach (Person p in peopleList)
            Console.WriteLine(p.firstName + " " + p.lastName);
            //Your code goes here
            Console.WriteLine("Hello, world!");
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0.11 sec, absolute running time: 0.11 sec, cpu time: 0.08 sec, average memory usage: 18 Mb, average nr of threads: 5