Read original post by Kevin Michael Woley at Windows 8 App Developer Blog
In part 1 of this post, we learned how to design tile updates and choose the templates to match the content you want to show on your live tile. We got the app set up with a wide default tile and now we’re ready to start updating our tiles. Now, we dive straight into the code. First, we’ll see how to set up polling on our Contoso Food Trucks app tile, including what our web service code looks like. Then we add a secondary tile to the app and update it using the NotificationsExtension library provided in the Windows 8 SDK App tiles and badges sample. Let’s get right to it!