public ActionResult EditStudent(StudentModel model)
        {
            HttpCookie loggedStudent = Request.Cookies["LoggedUser"];
            UserServices services = new UserServices();
            StudentModel student = services.GetStudent(loggedStudent.Values.Get("Login"));
            services.ChangePassword(student.Login, student.Name, student.Surname, model.Password);

            UserLoginModel logged = new UserLoginModel();
            logged.Login = student.Login;
            logged.Name = student.Name;
            logged.Surname = student.Surname;
            return RedirectToAction("Index",logged);
        }
        public ActionResult EditTeacher(TeacherModel model)
        {
            HttpCookie loggedTeacher = Request.Cookies["LoggedUser"];
            UserServices services = new UserServices();
            TeacherModel teacher = services.GetTeacher(loggedTeacher.Values.Get("Login"));
            services.ChangePassword(teacher.Login, teacher.Imię, teacher.Nazwisko, model.Hasło);

            UserLoginModel logged = new UserLoginModel();
            logged.Login = model.Login;
            logged.Name = model.Imię;
            logged.Surname = model.Nazwisko;
            return RedirectToAction("Index", logged);
        }