using System;

​

#nullable enable                    

public class Program

{

    public static void Main()

    {

        var test1 = new Foo();

        var test2 = new Foo

        {

            Bar = new Bar()

        };

        test1.Bar.Test = true; //this line throws NullPointerException :P

        if(test1?.Bar?.Test == false)

        {

            Console.WriteLine("Test 1 Bar was false");

        }

        if(test2?.Bar?.Test == false)

        {

            test2.Bar.Test = true;

            Console.WriteLine($"Test 2 Bar is {test2.Bar.Test}");

        }

    }

    class Foo

    {

        public Bar? Bar {get;set;}

    }

    class Bar

    {

        public bool Test {get;set;}

    }

    #nullable restore

}