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Windows Phone 8 Development Tips and Tricks
Change your application title as it appears on the phone app list

Go to the WMAppManifest.xml in the Properties folder and edit the Title attribute in the App line or open it in the editor and update the title and other attributes

Title="Your Product Name"

Stop the lock screen from popping up

PhoneApplicationService.Current.UserIdleDetectionMode = IdleDetectionMode.Disabled;

Setup a menu with navigation to another page

// Set the page's ApplicationBar to a new instance and minimize it used when no buttons/icons are needed
ApplicationBar = new ApplicationBar
     Mode= ApplicationBarMode.Minimized,

ApplicationBarMenuItem menuItem = new ApplicationBarMenuItem(AppResources.Token);
menuItem.Click += (s, ev) => { NavigationService.Navigate(new Uri("/Token.xaml", UriKind.Relative)); };

Using geolocation (GPS) services

// Get a high accuracy watcher, usually called from a Dispatcher Timer so it won’t block the UI and be reset after a period (usually 15 minutes) of time
GeoCoordinateWatcher watcher = new GeoCoordinateWatcher(GeoPositionAccuracy.High);

// MovementThreshold is in meters
watcher.MovementThreshold = 100;
// Add event handlers for StatusChanged and PositionChanged events
watcher.PositionChanged += (s, ev) =>
          // Get the user's location
          latitude = ev.Position.Location.Latitude.ToString("00.00000");
          longitude = ev.Position.Location.Longitude.ToString("00.00000");

          // Stop the watcher because the method will be called again in 15 minutes
     catch (Exception ex)
     { }

     // Start data acquisition