using System;

 using System.Collections;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 namespace ConsoleApplication1

 {

     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 = ; 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 = -;

         public PeopleEnum(Person[] list)

         {

             _people = list;

         }

         public bool MoveNext()

         {

             position++;

             return (position < _people.Length);

         }

         public void Reset()

         {

             position = -;

         }

         object IEnumerator.Current

         {

             get

             {

                 return Current;

             }

         }

         public Person Current

         {

             get

             {

                 try

                 {

                     return _people[position];

                 }

                 catch (IndexOutOfRangeException)

                 {

                     throw new InvalidOperationException();

                 }

             }

         }

     }

     class Program

     {

         static void Main(string[] args)

         {

             Person[] peopleArray = new Person[]

             {

                 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);

         }

     }

 }