Can you help me in getting the current location....i provided the code iam using ..(windows mobile..)

hi i am using this to get the Current location.


currently i am getting the value from longitude and lattitude (default value)

i need to get the current location randomly when the person changes the location..


using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.Device.Location;
using SimpleGPS.Terra;
using Microsoft.Phone.Controls.Maps;

namespace SimpleGPS
{
public partial class MainPage : PhoneApplicationPage
{
Terra.TerraServiceSoapClient client = new Terra.TerraServiceSoapClient();

double latitude, longitude;

// Constructor
public MainPage()
{
InitializeComponent();
client.ConvertLonLatPtToNearestPlaceCompleted += new EventHandler(client_ConvertLonLatPtToNearestPlaceCompleted);
mapBing.ZoomBarVisibility = System.Windows.Visibility.Visible;
}

void client_ConvertLonLatPtToNearestPlaceCompleted(object sender, ConvertLonLatPtToNearestPlaceCompletedEventArgs e)
{
txtResult.Text = e.Result;
mapBing.Center = new GeoCoordinate(latitude, longitude);
mapBing.ZoomLevel = 10;
}

private void btnGet_Click(object sender, RoutedEventArgs e)
{
txtResult.Text = "Loading....";
GeoCoordinateWatcher myWatcher = new GeoCoordinateWatcher();
var myPosition = myWatcher.Position;

// Here iam getting the location of the user...
but here it is maually wrote the longittude and lattitude.

i need to get the location default.


latitude = 61.066;
longitude = 28.183;

if (!myPosition.Location.IsUnknown)
{
latitude = myPosition.Location.Latitude;
longitude = myPosition.Location.Longitude;
}

client.ConvertLonLatPtToNearestPlaceAsync(new Terra.LonLatPt { Lat = latitude, Lon = longitude });
}
}
}