async void ExitedRegion(object sender, MonitorEventArgs e)
 {
     await UpdateDisplay("They went away :(");
 }
 async void DeterminedStateForRegionComplete(object sender, MonitorEventArgs e)
 {
     await UpdateDisplay("I have just switched from seeing/not seeing beacons: " + e.State);
 }
 async void EnteredRegion(object sender, MonitorEventArgs e)
 {
     await UpdateDisplay("A new beacon just showed up!");
 }