static void Main(string[] args)
{
Author author = new Author("Steve", "Balmer");
author.PropertyChanged += author_PropertyChanged;
author.AuthorLastName = "aaa";
Console.ReadKey();
}
public Book(Author author, string bookName)
{
_author = author;
_bookName = bookName;
}
public Book()
{
_author = new Author();
_bookName = "";
}