static void Main(string[] args) { Yearlease customer1 = new Yearlease(100, "2011-09-08", "2011-10-08"); //customer1.ExtractCharacters("2011-10-10",out ); customer1.Howmuch(10); Daylease customer2 = new Daylease('y', 1000, "2011-05-08", "2011-08-09", 10); customer2.Howmuch(1); Daylease customer3 = new Daylease('n', 1000, "2011-05-08", "2011-08-09", 10); }