title: Error occured when debugging the programme i copied as a sample from others
body: <p>You can call me marcus. I'm currently studying in a polytechnic in singapore and i'm doing my final year project. And my task is to create a application which is able to connect to my own server. Well, before i start off with anything, i did my research and came across a website, <strong>Building Your First Windows Phone App with Silverlight and Visual Studio 2010 Submitted by Alvin Ashcraft on Wed, 2010/03/24 - 9:30am</strong>. I have copied everything as at the webpage but my final result was that i had some errors and i'm not too sure why is that so. Would it be okay if you guys can tell me where have i gone wrong? Sorry but to trouble you guys. I am new to this programming and would hope to learn something from you guys. For any of your referrence, the webpage is <a href="http://dotnet.dzone.com/articles/building-your-first-windows?mz=27249-windowsphone7" rel="nofollow">http://dotnet.dzone.com/articles/building-your-first-windows?mz=27249-windowsphone7</a></p>
  
  <p>This is the code i typed which is exactly the same on the webpage. But there were 3 error. The errors are as below.</p>
  
  <blockquote>
    <p>The name 'XElement' does not exist in
    the current context<br>
    Mainpage.xaml.cs   49    27 The type
    of namespace name 'XElement' could not
    be found ( are you missing a using
    directive or an assembly reference?)<br>
    Mainpage.xaml.cs   49  5 The type of
    namespace name 'XNamespace' could not
    be found ( are you missing a using
    directive or an assembly reference?) 
    Mainpage.xaml.cs   50  5</p>
  </blockquote>
  
  <p>The code of mine which i copied from the website is below. Really thank you if you could help me with this.</p>
  
  <pre><code>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 Microsoft.Phone.Controls;
  
  namespace DotNetZoneReader
  {
      public partial class MainPage : PhoneApplicationPage
      {
          public MainPage()
          {
              InitializeComponent();
  
              SupportedOrientations = SupportedPageOrientation.Portrait | SupportedPageOrientation.Landscape;
          }
  
          private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
          {
  
          }
  
          private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
          {
  
          }
  
          private void storyList_SelectionChanged(object sender, SelectionChangedEventArgs e)
          {
  
          }
  
          private void button1_Click(object sender, RoutedEventArgs e)
          {
              var dzoneRss = new WebClient();
              dzoneRss.DownloadStringCompleted += dzoneRss_DownloadStringCompleted;
              dzoneRss.DownloadStringAsync(new Uri("http://feeds.dzone.com/zones/dotnet"));
          }
          private void dzoneRss_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
  {
      if (e.Error != null) return;
      XElement xmlStories = XElement.Parse(e.Result);
      XNamespace dz = "http://www.developerzone.com/modules/dz/1.0";
      storyList.ItemsSource = from story in xmlStories.Descendants("item")
      select new FeedItem
                             {
  
  Title = story.Element("title").Value,
  
  Description =  story.Element("description").Value,
  
  Link =  story.Element("link").Value,
  
  PublishDate = Convert.ToDateTime(story.Element(dz + "submitDate").Value).ToString("dd-MMM"),
  
  Author = story.Element(dz + "submitter").Element(dz + "username").Value,
  
  AuthorImageUrl = story.Element(dz + "submitter").Element(dz + "userimage").Value
  
  };
  }
          public class FeedItem
      {
      public string Title { get; set; }
      public string Description { get; set; }
      public string Link { get; set; }
      public string PublishDate { get; set; }
      public string Author { get; set; }
      public string AuthorImageUrl { get; set; }
  }
      }
  }
  </code></pre>
  
  <p>Hope to hear from you soon and really appreciate if you can help me with it please and sorry to trouble you. :)
  Yours Sincerely,
  Marcus</p>