public ActionResult Login(User model)// кастомная модель
        {
            if (ModelState.IsValid)
            {
                if (Membership.ValidateUser(model.Email, model.Password))
                {

                        FormsAuthentication.SetAuthCookie(model.Email, false);
                        return RedirectToAction("List", "Student");
                }
                else
                {
                    ModelState.AddModelError("", "Ви ввели невірний пароль");
                }
            }
            return View(model);
        }
        public MembershipUser CreateUser(string email, string password)
        {
            MembershipUser membershipUser = GetUser(email, false);

            if (membershipUser == null)
            {
                try
                {
                    using (StudentListContext _db = new StudentListContext())
                    {
                        User user = new User();
                        user.Email = email;
                        user.Password = Crypto.HashPassword(password);

                        _db.Users.Add(user);
                        _db.SaveChanges();
                        membershipUser = GetUser(email, false);
                        return membershipUser;
                    }
                }
                catch
                {
                    return null;
                }
            }
            return null;
        }