public IHttpActionResult Get(int?id) { if (id == null) { return(BadRequest()); } Mark markEntity = _repo.GetMarkById((int)id); if (markEntity == null) { return(NotFound()); } var mark = new MarkDto() { Id = markEntity.Id, MarkValue = markEntity.MarkValue, Importance = markEntity.Importance }; return(Ok(mark)); }