using System;

public class Program

{

    public static void Main()

    {

        var cmpMap = new System.Collections.Generic.Dictionary<int, string>

        {

            [-1] = "less than",

            [0] = "equal to",

            [1] = "greater than"

        };

        var desafiador = new Person() { Name = "Desafiador", YearOfBirth = 1986, MonthOfBirth = 1, DayOfBirth = 28 };

        var chernobyl = new Person() { Name = "Chernobyl", YearOfBirth = 1986, MonthOfBirth = 4, DayOfBirth = 26 };

        Console.WriteLine("{0} is {1} {2}", desafiador.Name, cmpMap[Compare(desafiador, chernobyl)], chernobyl.Name);

    }

    public static int Compare(Person A, Person B)

    {

        int result = A.YearOfBirth.CompareTo(B.YearOfBirth); // A -1 smaller, 0 equal, 1 greater B

        if ( result == 0 )

        {

            result = A.MonthOfBirth.CompareTo(B.MonthOfBirth);

            if ( result == 0 )

            {

                result = A.DayOfBirth.CompareTo(B.DayOfBirth);

            }

        }

        return result;

    }

}

​

public class Person

{

    public string Name {get; set;}

    public int YearOfBirth {get; set;}

    public int MonthOfBirth {get; set;}

    public int DayOfBirth {get; set;}

}

​

​