Windows Store Apps and Youtube API (C#)

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Devices.Geolocation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

using System.Net.Http;

using System.Xml.Linq;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Collections.ObjectModel;
using System.Text;

using Windows.UI.Xaml.Media.Imaging;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238

namespace WindowsStoreApps
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    /// 

    public class YoutubeList
    {
        public string Name { get; set; }
        public string YoutubeID { get; set; }
        public string Image { get; set; }
        public BitmapImage ImagePath { get; set; }
    }

    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        protected BitmapImage getImageSource(string url)
        {
            try
            {
                BitmapImage bm = new BitmapImage(new Uri(url, UriKind.Absolute));
                return bm;
            }
            catch (Exception ex)
            {
                return null;
            }

        }

        protected async override void OnNavigatedTo(NavigationEventArgs e)
        {

            HttpClient http = new System.Net.Http.HttpClient();
            HttpResponseMessage response = await http.GetAsync("http://localhost/myweb/getPlaylist.php");
            response.EnsureSuccessStatusCode();

            string resultJSON = string.Empty;
            resultJSON = await response.Content.ReadAsStringAsync();

            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(resultJSON));
            ObservableCollection<YoutubeList> list = new ObservableCollection<YoutubeList>();
            DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(ObservableCollection<YoutubeList>));
            list = (ObservableCollection<YoutubeList>)serializer.ReadObject(ms);

            List<YoutubeList> ls = new List<YoutubeList>();

            foreach (YoutubeList item in list)
            {
                ls.Add(new YoutubeList { Name = item.Name, YoutubeID = item.YoutubeID, Image = item.Image, ImagePath = getImageSource(item.Image) });
            }
            this.myGridView.ItemsSource = ls;  

        }

        private void myGridView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            YoutubeList youtube = (sender as GridView).SelectedItem as YoutubeList;
            this.Frame.Navigate(typeof(PlayVideo), youtube.YoutubeID.ToString());
        }

    }
}

<Page
    x:Class="WindowsStoreApps.PlayVideo"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:WindowsStoreApps"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <MediaElement x:Name="myMedia" HorizontalAlignment="Left" Height="416" Margin="90,91,0,0" VerticalAlignment="Top" Width="656"/>
    </Grid>
</Page>