public void Show()
        {
            //var (first, last) = GetFirstAndLastname();

            //var firstName = GetFirstAndLastname();

            var firstAndLastName = new FirstAndLastName("Jenny", "?");
            var (firstName, lastName) = firstAndLastName; //automatically calls method Deconstruct.

        }
        public void ShowAssignByOut ()
        {
            string first;
            string last;

            var firstAndLastName = new FirstAndLastName("Jenny", "?");

            firstAndLastName.AssignByOut(out first, out last);
        }