static void DeleteTeacherAccount() { int id; string idTry; while (true) { Console.WriteLine("Please Enter The ID Which You Want To Delete: "); idTry = Console.ReadLine(); try { id = Int32.Parse(idTry); if (!itb.DeleteTeacherById(id)) { Console.WriteLine("Delete Error, This ID Is Not Exists !"); } else { Console.WriteLine("Delete Successful! "); } break; } catch (Exception e) { Console.WriteLine("Please Enter a Number! "); continue; throw; } } }