Background timer to update UI?

You need two things for it:

1. Timer

   You can update the UI in System.Timers.Timer with the 10 seconds interval.

2. Dispatcher

   You need to use Dispatcher.Invoke to change the UI without holding the main UI thread. Instead the method Process should be called on a separate thread (Timer method), other than main UI thread, and use Dispatcher in it to alert main UI thread for the change.

   Process() // method to be called after regular interval in Timer
   {
       // lengthy process, i.e. data fetching and processing etc.
   
       // here comes the UI update part
       Dispatcher.Invoke((Action)delegate() { /* update UI */ });
   }