title: code how to get Internal/External storage of windows phone 8.1
body: <p>I'm confused how to get folder list in windows phone 8.1
  is there anyone have ever experienced this or have any idea? 
  I want to show all of the folder in storage in a listview
  Thanks</p>
  
  <pre><code>var storageAssets = await ExternalStorage.GetExternalStorageDevicesAsync();
  ExternalStorageDevice item = storageAssets.FirstOrDefault();
  ExternalStorageFolder folder = item.RootFolder;
  var _folderList = await folder.GetFoldersAsync();
  foreach (var _folder in _folderList)
  {
       Debug.WriteLine(_folder.Name);
  }
  </code></pre>
  
  <p>I'm trying to show them using debug first before store in listview
  but the code error says that ExternalStorage dosen't exist</p>