using System;

public class Program

{

    public static void Main()

    {

        Item item = null;

        Console.WriteLine("item?.IsFreeOffer ?? true:    {0}", item?.IsFreeOffer ?? true);

        Console.WriteLine("!item?.IsFreeOffer ?? true:   {0}", !item?.IsFreeOffer ?? true);

        Console.WriteLine();

        Console.WriteLine("!(item?.IsFreeOffer ?? true): {0}", !(item?.IsFreeOffer ?? true));

    }

    public class Item {

        public bool IsFreeOffer { get; set; }

    }

}