Incorporate Mapping: Bing Maps and Google Maps

Incorporate mapping Bing maps and Google maps into one application - using C# in Windows Phone SDK and SQl server.

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namespace PhoneApp
{
    public partial class MainPage : PhoneApplicationPage
    {
       Service1Client client;
       // Constructor
       public MainPage()
       {
         
            InitializeComponent();
            client = new Service1Client();
            textUserName.Focus();
            textUserName.Text = "";
            passwordBox1.Password = "";

            textBlock4.Text = string.Format(" You must sign in the system {0} For example {1} user : seid {2} password 111111", Environment.NewLine, Environment.NewLine, Environment.NewLine); ;
       }

       private void button1_Click(object sender, RoutedEventArgs e)
       {
          // NavigationService.Navigate(new Uri("/Page/ActionPage.xaml?uname=" + textUserName.Text, UriKind.Relative));

            client.GetUserCompleted += new EventHandler<GetUserCompletedEventArgs>(client_GetUserCompleted);
            client.GetUserAsync(textUserName.Text, passwordBox1.Password);
       }

       void client_GetUserCompleted(object sender, GetUserCompletedEventArgs e)
       {
            if (e.Error != null || e.Result == null)
            {
                canvas1.Visibility = System.Windows.Visibility.Visible;
            }
            else
       {...