public ActionResult ExternalLoginCallback(string returnUrl)
        {
            AuthenticationResult result = OAuthWebSecurity.VerifyAuthentication(Url.Action("ExternalLoginCallback", new { ReturnUrl = returnUrl }));
            if (!result.IsSuccessful)
            {
                return RedirectToAction("ExternalLoginFailure");
            }

            if (OAuthWebSecurity.Login(result.Provider, result.ProviderUserId, createPersistentCookie: false))
            {
                return RedirectToLocal(returnUrl);
            }

            if (User.Identity.IsAuthenticated)
            {
                // If the current user is logged in add the new account
                OAuthWebSecurity.CreateOrUpdateAccount(result.Provider, result.ProviderUserId, User.Identity.Name);
                return RedirectToLocal(returnUrl);
            }

            // User is new, ask for their desired membership name
            var loginData = OAuthWebSecurity.SerializeProviderUserId(result.Provider, result.ProviderUserId);
            ViewBag.ProviderDisplayName = OAuthWebSecurity.GetOAuthClientData(result.Provider).DisplayName;
            ViewBag.ReturnUrl = returnUrl;

            var registerExternalModel = new RegisterExternalLoginModel
                {
                    UserName = result.UserName,
                    ExternalLoginData = loginData
                };

            if (result.ExtraData.ContainsKey("name") && !string.IsNullOrEmpty(result.ExtraData["name"]))
            {
                var fullName = result.ExtraData["name"].Split(' ');
                registerExternalModel.FirstName = fullName[0];
                registerExternalModel.LastName = fullName[fullName.Count() - 1];
            }

            return View("ExternalLoginConfirmation", registerExternalModel);
        }
        public ActionResult ExternalLoginConfirmation(RegisterExternalLoginModel model, string returnUrl)
        {
            string provider = null;
            string providerUserId = null;

            if (User.Identity.IsAuthenticated || !OAuthWebSecurity.TryDeserializeProviderUserId(model.ExternalLoginData, out provider, out providerUserId))
            {
                return RedirectToAction("Manage");
            }

            if (ModelState.IsValid)
            {
                // Insert a new user into the database
                using (var db = new EtiketiUstundeDbContext())
                {
                    UserProfile user = db.UserProfiles.FirstOrDefault(u => u.UserName.ToLower() == model.UserName.ToLower());
                    // Check if user already exists
                    if (user == null)
                    {
                        // Insert name into the profile table
                        db.UserProfiles.Add(new UserProfile { UserName = model.UserName, FirstName = model.FirstName, LastName = model.LastName});
                        db.SaveChanges();

                        OAuthWebSecurity.CreateOrUpdateAccount(provider, providerUserId, model.UserName);
                        OAuthWebSecurity.Login(provider, providerUserId, createPersistentCookie: false);

                        return RedirectToLocal(returnUrl);
                    }
                    else
                    {
                        ModelState.AddModelError("UserName", "User name already exists. Please enter a different user name.");
                    }
                }
            }

            ViewBag.ProviderDisplayName = OAuthWebSecurity.GetOAuthClientData(provider).DisplayName;
            ViewBag.ReturnUrl = returnUrl;
            return View(model);
        }