static void Main(string[] args)
        {
            int         choose = 0;
            BookLibrary lib    = new BookLibrary();

            do
            {
                Console.WriteLine("1. Add New A Book");
                Console.WriteLine("2. Update A Book");
                Console.WriteLine("3. Delete A Book");
                Console.WriteLine("4. Print Out All Book");
                Console.WriteLine("5. Quit");
                while (true)
                {
                    try
                    {
                        Console.WriteLine("YOUR CHOCE: ");
                        choose = int.Parse(Console.ReadLine());
                        if (choose <= 0 || choose > 5)
                        {
                            Console.WriteLine("Range between 1 and 5");
                            throw new Exception();
                        }
                        break;
                    }
                    catch (Exception ex)
                    {
                    }
                }

                switch (choose)
                {
                case 1:
                    lib.AddNewBook();
                    break;

                case 2:
                    int IdToUpdate = 0;
                    while (true)
                    {
                        try
                        {
                            Console.WriteLine("Input Book's Id: ");
                            String BookId = Console.ReadLine();
                            for (int i = 0; i < BookId.Length; i++)
                            {
                                if (!Char.IsDigit(BookId[i]))
                                {
                                    Console.WriteLine("Please input right number");
                                    throw new Exception();
                                }
                            }
                            IdToUpdate = int.Parse(BookId);
                            //if (checkId(id) == true)
                            //{
                            //    Console.WriteLine("Your id has been registed");
                            //    throw new Exception();
                            //}

                            break;
                        }
                        catch (Exception ex)
                        {
                            //Console.WriteLine(ex.Message);
                        }
                    }
                    lib.UpdateBook(IdToUpdate);
                    break;

                case 3:

                    int IdToDelete = 0;
                    while (true)
                    {
                        try
                        {
                            Console.WriteLine("Input Book's Id: ");
                            String BookId = Console.ReadLine();
                            for (int i = 0; i < BookId.Length; i++)
                            {
                                if (!Char.IsDigit(BookId[i]))
                                {
                                    Console.WriteLine("Please input right number");
                                    throw new Exception();
                                }
                            }
                            IdToDelete = int.Parse(BookId);
                            //if (checkId(id) == true)
                            //{
                            //    Console.WriteLine("Your id has been registed");
                            //    throw new Exception();
                            //}

                            break;
                        }
                        catch (Exception ex)
                        {
                            //Console.WriteLine(ex.Message);
                        }
                    }
                    if (lib.checkId(IdToDelete))
                    {
                        Console.WriteLine(" Do you want to delete that book ( YES to delete) ");
                        String option = Console.ReadLine();
                        if (option.Equals("YES", StringComparison.OrdinalIgnoreCase))
                        {
                            lib.DeleteBook(IdToDelete);
                        }
                    }

                    break;

                case 4:
                    lib.PrintAllBook();
                    break;

                case 5:
                default: Console.WriteLine("Google bye "); break;
                }
            }while (choose >= 1 && choose < 5);
        }