title: UWP update UI control from a task running in a different thread
body: <p>UI has a label named lblMyLabel.
  It’s bound to a view model MyViewModel.</p>
  
  <p>A task is running on a different thread which pulls message from a service.( for example)</p>
  
  <p>When a this task receives a specific value it should update the UI label with it. </p>
  
  <p>I always get a error that it was Marshalled in a different thread .</p>