title: How can I get LongListSelector SelectedItem as a string in WP8
body: <p>I have a longlistselector like the below image. now I wanna get the text of the item user's tapped. I've searched a lot but no solution found ;(
  pay attention to the image please to give a sample code</p>
  
  <p><a href="http://amiryari.persiangig.com/image/stackoverflow-question.jpg" rel="nofollow">http://amiryari.persiangig.com/image/stackoverflow-question.jpg</a></p>