using System;

using System.Collections.Generic;

using System.Linq;

​

public class Person

{

    public string firstName, lastName;

    public Person(string firstName, string lastName)

    {

        this.firstName = firstName;

        this.lastName = lastName;

    }

    public override string ToString()

    {

        return this.firstName + " " + this.lastName;

    }

}

​

​

public class People

{

    public static void Main()

    {

        List<Person> people = new List<Person>() {

            new Person("Georgi", "Test"),

            new Person("Georgi", "Arz"),

            new Person("Stamat", "Djiri"),

            new Person("Arin", "Arno")

        };

        var lambdaOrder = people.OrderBy(person => person.firstName)

            .ThenBy(person => person.lastName);

        var linqOrder = 

            from person in people

                orderby person.firstName, person.lastName

                select person;

        Console.WriteLine("Unsorted:");

        foreach(Person person in people)

        {

            Console.WriteLine(person);

        }

        Console.WriteLine();

        Console.WriteLine("Lambda:");

        foreach(Person person in lambdaOrder)

        {

            Console.WriteLine(person);

        }

        Console.WriteLine();

        Console.WriteLine("Linq:");

        foreach(Person person in linqOrder)

        {

            Console.WriteLine(person);

        }

        Console.WriteLine();

    }

}