public static void Main()
Console.WriteLine("item?.IsFreeOffer ?? true: {0}", item?.IsFreeOffer ?? true);
Console.WriteLine("!item?.IsFreeOffer ?? true: {0}", !item?.IsFreeOffer ?? true);
Console.WriteLine("!(item?.IsFreeOffer ?? true): {0}", !(item?.IsFreeOffer ?? true));
public bool IsFreeOffer { get; set; }