public void Start() { Debugger.Break(); var phoneBook = LoadPhoneBook(); using (var memoryStream = new MemoryStream()) { phoneBook.Save(memoryStream); memoryStream.Seek(0, SeekOrigin.Begin); var loadedPhoneBook = PhoneBook.CreateFromStream(memoryStream); Debug.Assert(phoneBook == loadedPhoneBook, "Something went wrong!!!"); } }