/// <summary>
        /// Adds a question
        /// </summary>
        /// <param name="qyfEntities">Entity context</param>
        /// <param name="idOwner">User id of the owner</param>
        /// <param name="idReceiver">User id of the receiver</param>
        /// <param name="text">Question content</param>
        /// <param name="anonPrice">Price to anonymize</param>
        /// <param name="privatePrice">Price to privatize</param>
        /// <param name="datePub">Publication date</param>
        /// <returns>The id of the created Question</returns>
        public static int Create(QuestionYourFriendsEntities qyfEntities, int idOwner, int idReceiver,
            string text, int anonPrice, int privatePrice, DateTime datePub)
        {
            try
            {
                _logger.InfoFormat("New question creation: owner({0}), receiver({1}), text({2}), anon({3}), priv({4}), datePub({5})",
                    idOwner, idReceiver, text, anonPrice, privatePrice, datePub);
                var question = new QuestionYourFriendsDataAccess.Question
                                   {
                                       OwnerReference =
                                           {
                                               EntityKey =
                                                   new EntityKey("QuestionYourFriendsEntities.Users", "id", idOwner)
                                           },
                                       ReceiverReference =
                                           {
                                               EntityKey =
                                                   new EntityKey("QuestionYourFriendsEntities.Users", "id", idReceiver)
                                           },
                                       text = text,
                                       answer = null,
                                       anom_price = anonPrice,
                                       private_price = privatePrice,
                                       undesirable = false,
                                       date_pub = datePub,
                                       date_answer = null,
                                       deleted = false
                                   };

                qyfEntities.AddToQuestions(question);
                qyfEntities.SaveChanges();
                _logger.InfoFormat("New question id: {0}", question.id);
                return question.id;
            }
            catch (Exception ex)
            {
                _logger.Error("Cannot create a new question", ex);
                throw new ApplicationException("A database error occured during the operation.");
            }
        }
 /// <summary>
 /// Adds a question
 /// </summary>
 /// <param name="qyfEntities">Entity context</param>
 /// <param name="q">Question to add</param>
 /// <returns>The id of the created Question</returns>
 public static int Create(QuestionYourFriendsEntities qyfEntities, QuestionYourFriendsDataAccess.Question q)
 {
     try
     {
         _logger.InfoFormat("New question creation: owner({0}), receiver({1}), text({2}), anon({3}), priv({4}), datePub({5})",
             q.Owner.id, q.Receiver.id, q.text, q.anom_price, q.private_price, q.date_pub);
         qyfEntities.AddToQuestions(q);
         qyfEntities.SaveChanges();
         _logger.InfoFormat("New question id: {0}", q.id);
         return q.id;
     }
     catch (Exception ex)
     {
         _logger.Error("Cannot create a new question", ex);
         throw new ApplicationException("A database error occured during the operation.");
     }
 }