public void SaveMessageForUser(long senderId, ConverastionMessage message)
        {
            GenericError error;

            message.SenderUserId = senderId;

            MessagesRepository.InsertEntity(out error, message);
        }
 private static bool IsParticipant(long userId, ConverastionMessage message)
 {
     return (message.Receivers.Any(r => r.UserId == userId)) || message.SenderUserId == userId;
 }