title: Background timer to update UI?
body: <p>I got a little problem with my application.<br>
  I would like to update something on my UI every 10 seconds. I first used a <code>DispatcherTimer</code> for this but it will block my UI for a short time because the update method needs to load something from the web and this operation needs some time.
  Now I thought about some kind of background worker and I found BackgroundTasks.<br>
  The problem with Background tasks is, as far as I understood it correctly, that they are supposed to serve as updaters even if the app is suspended. I don't need that.
  I only would like to update if my app is running not if it is suspended.</p>
  
  <p>Is there a good way to solve this?
  Any suggestions what to use for this?</p>
  
  <p>Thanks in advance!</p>