Bing Maps in Windows Phone

using System;
using System.Windows;
using Microsoft.Phone.Controls;

namespace BingMapsDemoV1
{
    public partial class PushpinProperties : PhoneApplicationPage
    {
        public PushpinProperties()
        {
            InitializeComponent();
        }

        private void addPin_Click(object sender, RoutedEventArgs e)
        {
            double longitude;
            double latitude;
            try
            {
                longitude = double.Parse(longitudeTB.Text.ToString());
                latitude = double.Parse(LatitudeTB.Text.ToString());
                SharedInformation.pinLong = longitude;
                SharedInformation.pinLat = latitude;
                SharedInformation.pinContent = textBox1.Text;

                MessageBox.Show("Your Pushpin was successfully set!");
                NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
            }
            catch (Exception exc)
            {
                MessageBox.Show("Please enter a valid location!" + exc.Message);
            }
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
        }
    }
}