private void Fill() { ServiceAPI api = new ServiceAPI(); var result = api.GetLatestQuestion().Result; if (!string.IsNullOrEmpty(result.Content)) { var list = JsonConvert.DeserializeObject<Rootobject>(result.Content).items; Stack_Question question; foreach (var item in list) { question = Mapper.Map<Item, Stack_Question>(item); if (!this.QuestionList.Any(x => x.Question_id == question.Question_id)) { this.QuestionList.Insert(0, question); } } //this.QuestionList.OrderBy(x => x.Creation_date); } }