protected override void OnNavigatedTo(NavigationEventArgs e)
{
    // Get a dictionary of query string keys and values.
    IDictionary<string, string> queryStrings = this.NavigationContext.QueryString;

    // Ensure that there is at least one key in the query string, and check 
    // if the "FileId" key is present.
    if (queryStrings.ContainsKey("FileId"))
    {
        // Retrieve the picture from the local Zune Media database using the FileID
        // passed to the application.
        MediaLibrary library = new MediaLibrary();
        Picture picture = library.GetPictureFromToken(queryStrings["FileId"]);

        // Create a WriteableBitmap object and add it to the Image control Source property.
        BitmapImage bitmap = new BitmapImage();
        bitmap.SetSource(picture.GetImage());
        WriteableBitmap picLibraryImage = new WriteableBitmap(bitmap);
        retrievePic.Source = picLibraryImage;
    }
}