Let's write a simple .NET 4 Location-aware application!

using System;

// This namespace is where you'll find the location API in .NET 4

// **Note that you'll have to add a reference to System.Device.dll first

using System.Device.Location;

namespace LocationConsoleApp

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Outputting location updates, press any key to exit...");

            // The LocationWatcher object will monitor location updates

            // and output them to the console

            LocationWatcher watcher = new LocationWatcher();

            Console.ReadKey();

        }

    }

    class LocationWatcher

    {

        // Root object for the .NET 4 Location API

        // we'll hang on to a reference for the lifetime of

        // the LocationWatcher object

        private GeoLocationProvider provider;

        public LocationWatcher()

        {

            // Initialize our private member

            this.provider = new GeoLocationProvider();

            // Subscribe to updates when our location changes

            this.provider.LocationChanged += new

                System.EventHandler<GeoLocationChangedEventArgs>(provider_LocationChanged);

            // When we call Start(), two things happen

            // 1. If we don't have permissions to access the location sensor(s),

            // the user will be presented with a dialog where they can grant

            // permissions

            // 2. If we have permissions, following this call, we'll be able to

            // access location data, and we'll get LocationChanged events if

            // we have setup an event handler

            this.provider.Start();

        }

        void provider_LocationChanged(object sender, GeoLocationChangedEventArgs e)

        {

            // Output the new location coordinate to the console if present

            if (e.Location.Coordinate != GeoCoordinate.Unknown)

            {

                Console.WriteLine(

                    "Latitude: " + e.Location.Coordinate.Latitude.ToString() +

                    " Longitude: " + e.Location.Coordinate.Longitude.ToString());

            }

        }

    }

}