public static void Main(string[] args)
{
var library = new Library()
.AddBook("Book1", 123, "Author1", "Department1")
.AddBook("Book2", 234, "Author2", "Department1")
.AddBook("Book3", 345, "Author3", "Department1")
.AddBook("Book4", 456, "Author1", "Department2")
.AddBook("Book5", 567, "Author2", "Department2");
Console.WriteLine("Books amount in the library: {0}", library.GetBooksCount());
library.PrintAllBooks();
library.PrintAllAuthors();
library.PrintAllDepartments();
//var xmlwork = new XmlWork();
//xmlwork.SortByPages("Library.xml");
IBookFactory bookhouse = new Bookhouse();
IBookFactory bookstore = new Bookstore();
Console.WriteLine(bookhouse.GetBook().ToString());
Console.WriteLine(bookstore.GetBook().ToString());
Console.ReadKey();
}