public Form1()
{
InitializeComponent();
IEdition book1 = new Directory(1987, 3, "A5", 253, "Hard", "Name1");
IEdition book2 = new Directory(1998, 2, "A4", 61, "Soft", "Name2");
Directory book3 = new Directory(2004, 1, "A4", 521, "Hard", "Name3");
IEdition book4 = new Directory(2013, 4, "A5", 413, "Hard", "Name4");
Directory book5 = new Directory(1977, 3, "A4", 644, "Hard", "Name5");
book1.AddAuthor(2);
book4.RemoveAuthor(1);
book5.ChangeName("Name55");
book3.SetBinding("Soft");
List <IEdition> Books = new List <IEdition>
{
book1, book2, book3, book4, book5
};
for (int i = 0; i < Books.Count; i++)
{
textBox1.Text += Books[i].ToString();
}
}