public ActionResult LogOn(AccountViewModel model, string ReturnUrl)
        {
            if (!String.IsNullOrEmpty(model.sifre) && model.sifre.Length > 0)
            {
                var user = baglanti()
                    .Select<Kullanici>()
                    .SingleOrDefault(x => x.kullanici_adi == model.kullanici_adi && x.sifre == model.sifre);

                if (user != null)
                {
                    FormsAuthentication.SetAuthCookie(user.ToString(), false);
                    Session["User"] = user;

                    return RedirectToAction("Index", "Home");
                }
                else if (user == null)
                {
                    return RedirectToAction("LogOn", "Account");
                }
            }
            else
            {
                ModelState.AddModelError("", "Kullanıcı Hatası.");
            }

            model.Message = Utils.Utils.GetModelStateErrors(ModelState, "<br>");
            return View(model);
        }
 public ActionResult LogOn()
 {
     var logOnModel = new AccountViewModel();
     return View(logOnModel);
 }