image的路径写法格式

if (MapGrid.Visibility == Visibility.Visible)
{
      this.MapGrid.Visibility = Visibility.Collapsed;
     ((Image)this.vis.Content).Source = new BitmapImage(new Uri("\Image\down2.png", UriKind.Relative));
}
else
{
this.MapGrid.Visibility = Visibility.Visible;
((Image)this.vis.Content).Source = new BitmapImage(new Uri("\Image\up2.png",UriKind.Relative));


}