static void Main(string[] args) { Console.WriteLine("{0,10}TASK FROM 1-4",string.Empty); Console.WriteLine(); GSM newGSMOne = new GSM("Lumia 900", "Nokia", 900, "Vasil");//instance with full contrsuctor arguments newGSMOne.PrintGSMInfo(); newGSMOne.BaterryInfo.PrintBaterryInfo(); newGSMOne.DisplayInfo.PrintDisplayInfo(); Console.WriteLine(); Console.WriteLine("{0,10}TASK FROM 5-7", string.Empty); GSMTest.TestGSM(); Console.WriteLine(); Console.WriteLine("{0,10}TASK FROM 8-12", string.Empty); GSMCallHistoryTest.AddCallTest(); GSMCallHistoryTest.PrintCallHistoty(); GSMCallHistoryTest.PrintBill(); Console.WriteLine(); GSM.RemoveCall(); Console.Write("Total Amout after we delete longest call is {0}."); GSMCallHistoryTest.PrintBill(); GSM.RemoveAllCalls(); Console.WriteLine("History after removing all Calls."); GSMCallHistoryTest.PrintCallHistoty(); }