ปัญหา Windows Phone Show List Data from Web Server (Website)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;

using System.Collections.ObjectModel;
using System.IO;
using System.Text;
using System.IO.IsolatedStorage;

namespace Train_Guide_Thailand
{
    public partial class SearchResultPage : PhoneApplicationPage
    {

        ProgressIndicator prog;

        public SearchResultPage()
        {
            InitializeComponent();
            

            string url = "http://169.254.80.80/searchData.php";
            Uri uri = new Uri(url, UriKind.Absolute);

            StringBuilder postData = new StringBuilder();
            postData.AppendFormat("{0}={1}", "NULL", HttpUtility.UrlEncode(""));

            WebClient client = default(WebClient);
            client = new WebClient();
            client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
            client.Headers[HttpRequestHeader.ContentLength] = postData.Length.ToString();

            client.UploadStringCompleted += client_UploadStringCompleted;
            client.UploadProgressChanged += client_UploadProgressChanged;

            client.UploadStringAsync(uri, "POST", postData.ToString());

            prog = new ProgressIndicator();
            prog.IsIndeterminate = true;
            prog.IsVisible = true;
            prog.Text = "Loading....";
            SystemTray.SetProgressIndicator(this, prog);
        }

        private void client_UploadProgressChanged(object sender, UploadProgressChangedEventArgs e)
        {

        }

        private void client_UploadStringCompleted(object sender, UploadStringCompletedEventArgs e)
        {


            if (e.Cancelled == false && e.Error == null)
            {
                MemoryStream ms = new MemoryStream( Encoding.UTF8.GetBytes(e.Result)); 
                ObservableCollection<Station> list = new ObservableCollection<Station>();
                DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(ObservableCollection<Station>));
                
                
                //fuckkkkk
                list = (ObservableCollection<Station>)serializer.ReadObject(ms);

                List<Station> myStation = new List<Station>();

                foreach (Station cm in list)
                {
                    string sStation_ID = cm.Station_ID.ToString();
                    string sStationName = cm.StationName.ToString();
                    string sLatitude = cm.Latitude.ToString();
                    string sLongtitude = cm.Longtitude.ToString();


                    myStation.Add(new Station(sStation_ID, sStationName, sLatitude, sLongtitude));
                }

                this.StationList.ItemsSource = myStation;
                prog.IsVisible = false;
            }

        }

        ////}

        [DataContract]
        public class Station
        {
            [DataMember]
            public string Station_ID { get; set; }

            [DataMember]
            public string StationName { get; set; }

            [DataMember]
            public string Latitude { get; set; }

            [DataMember]
            public string Longtitude { get; set; }

            public Station(string strStation_ID, string strStationName, string strLatitude, string strLongtitude)
            {
                this.Station_ID = strStation_ID;
                this.StationName = strStationName;
                this.Latitude = strLatitude;
                this.Longtitude = strLongtitude;

            }

        }

        //--------show header == Form-To
        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
            string msg1 = "";
            string msg2 = "";
            if (NavigationContext.QueryString.TryGetValue("msg1", out msg1))
            {
                formTxt.Text = msg1;

            }
            if (NavigationContext.QueryString.TryGetValue("msg2", out msg2))
            {
                toTxt.Text = msg2;
            }
        }
        //-----------------------------------------------
    }
}