using System;

using System.Linq;

​

public class Person

{

    public string FirstName;

    public string LastName;

    public Person(string first, string last)

    {

        this.FirstName = first;

        this.LastName = last;

    }

}

​

public class Program

{

    public static void Main()

    {

        var people = new [] 

        {

            new Person("Bob", "Bab"),

            new Person("Adam", "AAAAA")

        };

        var lastNames = people.Select(n => n.LastName);

        foreach (var l in lastNames)

        {

            Console.WriteLine(l);

        }

    }

}