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();
}