using System;

​

public class Program

{

    public static void Main()

    {

        var foo = new Foo();

        Console.WriteLine("Null propagation");

        Console.WriteLine(foo.Bar?.Length);

        Console.WriteLine("Ternary");

        Console.WriteLine(foo.Bar != null ? foo.Bar.Length : (int ? )null);

    }

}

​

class Foo

{

    public string Bar

    {

        get

        {

            Console.WriteLine("I was read");

            return string.Empty;

        }

    }

}