Null-Coalescing Short Circuit

using System;

class MainClass {
    static void Main() {
        A a = new A();
        a.Value = new A();
        Console.WriteLine("{0}", a?.DoIt()?.DoIt()?.DoIt());
        Console.WriteLine("Hello World!");
    }
}

public class A
{
    public A Value {get;set;}
}

public static class AExtensions
{
    public static A DoIt(this A a)
    {
        Console.WriteLine("IN IT, {0}, returning {1}", a == null ? "NULL A" : "NOT-NULL A", a.Value == null ? "NULL A" : "NOT-NULL A");
        return a.Value;
    }
}