public bool Delete(long id)
        {
            bool rc = false;

            try {
                if (id > 0)
                {
                    rc = db.Deleteable <LiveChatRoomMember>().Where(it => it.ID == id).ExecuteCommand() > 0;
                }
            }
            catch (Exception ex) {
                log.Error("Delete", ex);
            }

            return(rc);
        }
        public bool Delete(Advertisement model)
        {
            var i = db.Deleteable(model).ExecuteCommand();

            return(i > 0);
        }