public SimpleMembershipInitializer()
            {
                Database.SetInitializer<UsersContext>(null);

                try {
                  using (var context = new UsersContext()) {
                if (!context.Database.Exists()) {
                  // Create the SimpleMembership database without Entity Framework migration schema
                  ((IObjectContextAdapter)context).ObjectContext.CreateDatabase();
                }
                  }

                  WebSecurity.InitializeDatabaseConnection("DefaultConnection", "UserProfile", "UserId", "UserName", autoCreateTables: true);
                }
                catch (Exception ex) {
                  throw new InvalidOperationException("The ASP.NET Simple Membership database could not be initialized. For more information, please see http://go.microsoft.com/fwlink/?LinkId=256588", ex);
                }
            }
        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 (UsersContext db = new UsersContext()) {
              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 });
            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);
        }