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);
            }
        }