title: can not know windows phone 8 image format type
body: <p>Getting an image from media library on windows phone 8 using photo Chooser Task 
  class it works fine but i need to know the format of that image. using image class will not work.and i need to access the photos stored in the emulator from the windows i get the root of the image but can not find it</p>
  
  <pre><code> private void upload(object sender, RoutedEventArgs e)
      {
          var photoChooserTask = new PhotoChooserTask();
          photoChooserTask.Completed += PhotoChooserTaskCompleted;
          photoChooserTask.Show();
  
      }
  
      public void PhotoChooserTaskCompleted(object sender, PhotoResult e)
      {
          if(e.TaskResult == TaskResult.OK)
          converttobase64(e);
  
      }
  </code></pre>