public static void AddBook(List <Book> books)
        {
            Console.Clear();

            Console.Write("Enter book title: ");
            string title = Console.ReadLine();

            Console.Write("Enter author name: ");
            string author = Console.ReadLine();

            Console.Write("Enter publishing year: ");
            int yearPublished = Vaildation.IsInt(Console.ReadLine(), "publishing year again");

            Console.Write("Enter price: ");
            decimal price = Vaildation.IsDecimal(Console.ReadLine());

            books.Add(new Book()
            {
                Title = title, Author = author, YearPublished = yearPublished, Price = price
            });

            addBookCount++;
            Console.WriteLine("You added {0} book(s).", addBookCount);
            Console.Write("Do you want add another book? (Y/N)");
            if (Vaildation.IsYorN(Console.ReadLine()))
            {
                AddBook(books);
            }

            Program.CheckList();
        }
        public static List <Book> ReadXML(string filePath)
        {
            TextReader reader = null;

            try
            {
                var serializer = new XmlSerializer(typeof(List <Book>));
                reader = new StreamReader(filePath);
                return((List <Book>)serializer.Deserialize(reader));
            }
            catch
            {
                Console.Write("Do you want to create New file? (Y/N)");
                if (Vaildation.IsYorN(Console.ReadLine()))
                {
                    WriteXML(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "//" + Program.fileName + ".xml", CardCatalog.myBooks);
                }
                else
                {
                    Environment.Exit(0);
                }

                return(CardCatalog.myBooks);
            }
            finally
            {
                if (reader != null)
                {
                    reader.Close();
                }
            }
        }