using System;

public class Program

{

    public static void Main()

    {

        TheOldKanye kanye1 = new TheOldKanye("straight from the go kanye");

        Console.WriteLine(kanye1.kanyeType);

        try {

            kanye1 = new TheOldKanye(null);

        }

        catch (Exception) {

        }

        Console.WriteLine(kanye1.kanyeType);

        TheNewKanye kanye2 = new TheNewKanye("the bad mood kanye");

        Console.WriteLine(kanye2.kanyeType);

        try {

            kanye2 = new TheNewKanye(null);

        }

        catch (Exception) {

        }

        Console.WriteLine(kanye2.kanyeType);        

    }

}

​

public class TheOldKanye {

    public string kanyeType;

    public TheOldKanye(string kanyeType) {

        if (kanyeType == null) {

            throw new ArgumentNullException();

        }

        this.kanyeType = kanyeType;

    }

}

​

public class TheNewKanye {

    public string kanyeType;

    public TheNewKanye(string kanyeType) {

        this.kanyeType = kanyeType ?? throw new ArgumentNullException();

    }

}