static void Main(string[] args) { // create a one Person object Bibliography book = new Bibliography(); book.Type = "Kirja"; book.Name = "Raamattu"; book.Condition = "Ok"; book.Amount = 1; book.Pages = 1000; Bibliography magazine = new Bibliography(); magazine.Type = "Lehti"; magazine.Name = "Aku Ankka"; magazine.Condition = "Uusi"; magazine.Amount = 10; magazine.Pages = 50; Disk cd = new Disk(); cd.Type = "CD-Levy"; cd.Name = "Hiren's Boot CD"; cd.Condition = "Hyva"; cd.Amount = 1; Disk dvd = new Disk(); dvd.Type = "DVD-Levy"; dvd.Name = "Leffoja"; dvd.Condition = "Hyva"; dvd.Amount = 15; Disk bluray = new Disk(); bluray.Type = "Bluray-Levy"; bluray.Name = "Leffoja"; bluray.Condition = "Hyva"; bluray.Amount = 6; Device phone = new Device(); phone.Manufacturer = "Microsoft"; phone.Name = "Lumia 640"; phone.Color = "Orange"; phone.Condition = "Hyva"; phone.Amount = 1; Device tablet = new Device(); tablet.Manufacturer = "ASUS"; tablet.Name = "N/A"; tablet.Color = "Silver"; tablet.Condition = "Hyva"; tablet.Amount = 1; Device laptop = new Device(); laptop.Manufacturer = "N/A"; laptop.Name = "N/A"; laptop.Color = "N/A"; laptop.Condition = "N/A"; laptop.Amount = 1; // do something methods book.BibliographyWrite(); Console.ReadLine(); magazine.BibliographyWrite(); Console.ReadLine(); cd.DiskWrite(); Console.ReadLine(); dvd.DiskWrite(); Console.ReadLine(); bluray.DiskWrite(); Console.ReadLine(); phone.DeviceWrite(); Console.ReadLine(); tablet.DeviceWrite(); Console.ReadLine(); laptop.DeviceWrite(); Console.ReadLine(); Console.ReadLine(); Console.ReadLine(); }