public static void MenuQuanLiBoPhan()
        {
            int chon;

            do
            {
                Console.WriteLine("\t\t\t |===============================Quan Li Bo Phan===============================|\n");
                Console.WriteLine("\t\t\t |                            0. Quay Lai                                      |\n");
                Console.WriteLine("\t\t\t |                            1. Danh Sach Bo Phan                             |\n");
                Console.WriteLine("\t\t\t |                            2. Thoat                                         |\n");
                Console.WriteLine("\t\t\t |===================================CHOOSE====================================|\n");
                Console.WriteLine("Ban Chon: ");
                chon = int.Parse(Console.ReadLine());
                try {
                    switch (chon)
                    {
                    case 0:
                        QuanLiQuan.MenuQuanLiQuanCaPhe();
                        break;

                    case 1:
                        QuanLiBoPhan.HienThi();
                        break;

                    case 2:
                        Environment.Exit(0);
                        break;

                    default:
                        Console.WriteLine("Vui Long Nhap Lai");
                        break;
                    }
                }
                catch (System.FormatException) {
                    Console.WriteLine("Vui Long Nhap Chu So");
                }
            }while(chon != 0 || chon != 3);
        }