parse json windows phone 7?

public class Question
   {
       private int id;

       public int Id
       {
           get { return id; }
           set { id = value; }
       }
       private string quest;

       public string Quest
       {
           get { return quest; }
           set { quest = value; }
       }
       private int answer;

       public int Answer
       {
           get { return answer; }
           set { answer = value; }
       }
       private List<string> answer_arr;

       public List<string> Answer_arr
       {
           get { return answer_arr; }
           set { answer_arr = value; }
       }
   }

var resource = System.Windows.Application.GetResourceStream(new Uri(@"/LuatGiaoThong;component/Data/LuatGT_JSON.txt", UriKind.Relative));
            Stream fs = resource.Stream;
            StreamReader rd = new StreamReader(fs);
            var dict = (JObject)JsonConvert.DeserializeObject(rd.ReadToEnd());

            foreach (var obj in dict["questions"])
            {
                Question ques = new Question()
                {
                    Id = int.Parse(obj["id"].ToString()),
                    Quest = obj["question"].ToString(),
                    Answer_arr = new List<string>(),
                    Answer = int.Parse(obj["answer"].ToString())
                };
                
                JObject answers = (JObject)JsonConvert.DeserializeObject(obj["answer_arr"].ToString());
                MessageBox.Show(answers.ToString());
            }