public dynamic Process(NancyModule nancyModule, AuthenticateCallbackData model)
        {
            string lLoginCookie = new Tuple<object, object>(model.AuthenticatedClient.GetHashCode(),
                DateTime.Now.GetHashCode()).GetHashCode().ToString();

            using (umfrageDB db = new umfrageDB())
            {
                string lAuthHash =
                    MD5.Create()
                        .ComputeHash(Encoding.UTF8.GetBytes(model.AuthenticatedClient.UserInformation.Id))
                        .ToHex(false);

                if ((from p in db.users
                    where p.AuthenticationId == lAuthHash
                    select p).Any())
                {
                    db.users.Where(user => user.AuthenticationId == lAuthHash)
                        .Set(user => user.Guid, lLoginCookie).Set(user => user.LastLogin, DateTime.Now)
                        .Update();
                }
                else
                {
                    user lUser = new user
                    {
                        AuthenticationId = lAuthHash,
                        Guid = lLoginCookie,
                        TimeCreated = DateTime.Now,
                        LastLogin = DateTime.Now
                    };
                    db.Insert(lUser);
                }
            }

            return nancyModule.Response.AsRedirect("/").WithCookie("id", lLoginCookie);
        }
        private bool CheckIfCanAnswer(int frageId, user user)
        {
            using (umfrageDB db = new umfrageDB())
            {
                if (!(from frage in db.questions where frage.Id == frageId select frage).Any()) return false;

                IQueryable<answer> lFragenLogs = from fragenLog in db.answers
                    where
                        fragenLog.UserId == user.AuthenticationId &&
                        fragenLog.FrageId == frageId
                    select fragenLog;

                if (lFragenLogs.Any()) return false;
            }
            return true;
        }