private static void AddData()
        {
            string input;

            do
            {
                Console.WriteLine("\n========================== Adding Data of the Teacher record File =========================\n");
                Iteacher.AddTeacher();


                Console.WriteLine("\n\nWant to add more data?(Type yes/no)");
                input = Console.ReadLine();
            } while (input.Equals("yes"));
        }
        private static void UpdateData()
        {
            string input;

            do
            {
                string id;
                Console.WriteLine("\n========================= Updating Data of the Teacher record File ==========================\n");
                Console.WriteLine("Enter the Id of the teacher: ");
                id = Console.ReadLine();
                Iteacher.UpdateTeacher(id);
                Console.WriteLine("\n\nWant to update more data?(Type yes/no)");
                input = Console.ReadLine();
            } while (input.Equals("yes"));
        }
 private static void ListData()
 {
     Console.WriteLine("\n========================== List Data of the Teacher record File ==========================\n");
     Iteacher.GetTeacherList();
 }