static void DeleteStudent()
        {
            int    id;
            string idTry;

            while (true)
            {
                Console.WriteLine("Please Enter Student ID: ");
                idTry = Console.ReadLine();

                try
                {
                    id = Int32.Parse(idTry);
                    if (isb.DeleteStudentById(id))
                    {
                        Console.WriteLine("Student " + id + " Delete Successful !");
                    }
                    else
                    {
                        Console.WriteLine("Delete Error, Student ID Is Not Exists! ");
                    }
                    break;
                }
                catch (Exception e)
                {
                    Console.WriteLine("Please Enter ID As Int type!");
                    continue;
                    throw;
                }
            }
        }