public IHttpActionResult AnnouncementList(int from, int to)
        {
            var announcements = announcement_repository.GetAnnouncementList(from, to);

            return(Ok(new CollectionResponse()
            {
                TotalCount = announcement_repository.GetAnnouncementCount(),
                Collection = AnnouncementListItem.MapTo(announcements)
            }));
        }
        public IHttpActionResult AnnouncementList()
        {
            var announcements = announcement_repository.GetAnnouncementList();

            return(Ok(AnnouncementListItem.MapTo(announcements)));
        }