using System;

public class Program

{

    private class Item

    {

        public bool AmITrue { get; set; }

    }

    public static void Main()

    {

        Item item = null;

        Console.WriteLine(item?.AmITrue == true);

        item = new();

        Console.WriteLine(item?.AmITrue == true);

        item.AmITrue = true;

        Console.WriteLine(item?.AmITrue == true);

    }

}