public ActionResult Register(RegisterModel model)
    {
        if (ModelState.IsValid)
        {
            User user = null;
            using (UserContext db = new UserContext())
            {
                user = db.Users.FirstOrDefault(u => u.Email == model.Name);
            }
            if(user == null)
            {
                using (UserContext db  = new UserContext())
                {
                    db.Users.Add(new User {Email = model.Name, Password = model.Password, Age = model.Age });
                    db.SaveChanges();
                    user = db.Users.Where(u => u.Email == model.Name && u.Password == model.Password).FirstOrDefault();
                }
                //ecli polzovatel' udachno dabavlen  v bd
                if (user != null)
                {
                    FormsAuthentication.SetAuthCookie(model.Name, true);
                    return RedirectToAction("Index", "Home");
                }
            }
            else
            {
                ModelState.AddModelError("", "Pol'zovatel' s takim loginom uzhe sushestvuet");
            }
        }
        return View(model);

    }