public Book(Author bookAuthor, string title, string publishing)
{
BookAuthor = bookAuthor;
Title = title;
Publishing = publishing;
}
static void Main(string[] args)
{
Author ator = new Author("Josef", "Alexandrovich", "Brodsky");
Book book = new Book(ator, "Part of the talk", "Piter");
Book book_1 = new Book(ator, "Urania", "Moscow");
Catalogue ctlg = new Catalogue("A1P234");
ctlg.books.Add(book);
ctlg.books.Add(book_1);
ator.PropertyChanged += ShowInfo;
book.PropertyChanged += ShowInfo;
ctlg.PropertyChanged += ShowInfo;
ctlg.books[0].Title = "Part of the speech";
ator.FirstName = "Joseph";
}