Image loading from localhost is not working on silverlight - silverlight

Question

I making simple silverlight application.
I need to access and use an image from localhost,
I write down my code like this
Book4.Source = new BitmapImage(new Uri("http://localhost/test/book2.png", UriKind.Absolute));
It doesn't make any errors, but It can't load any image.
//P.S. I didn't use asp. It is OOB app.
* EDITED: To include additional content for the question.
public void changeValue_book()
{
if (empty_book[3] == true && book_index == 3)
{
empty_book[3] = false;
Book4.Visibility = Visibility.Visible;
Book3.Visibility = Visibility.Visible;
Book3.Source = null;
Book3.Source = new BitmapImage(new Uri("http://localhost/test/book1.png", UriKind.Absolute));
//Book3.Source = new BitmapImage(new Uri("Resource/책1.png", UriKind.Relative));
}
else if (empty_book[4] == true && book_index == 4)
{
empty_book[4] = false;
Book5.Visibility = Visibility.Visible;
Book4.Visibility = Visibility.Visible;
Book4.Source = new BitmapImage(new Uri("http://localhost/test/book2.png", UriKind.Absolute));
}
else if (empty_book[5] == true && book_index == 5)
{
}
}

Answer 1

If you're able to access the expected image from your web browser when you navigate to http://localhost/test/book2.png then try the following:
Uri uri = new Uri("http://localhost/test/book2.png", UriKind.Absolute);
ImageSource imageSource = new BitmapImage(uri);
Book4.Source = imageSource;
EDITED
If you're images reside on http://localhost/test/yourimagename.png, but your Silverlight application is hosted within an https:// or from the Filesystem you will not be able to load the images at all. The Silverlight Image class and MediaElement class for progressive downloads (media, images, ASX, etc.) are not allowed Cross-scheme access.
Please see this link for more details:
http://msdn.microsoft.com/en-us/library/cc189008(v=vs.95).aspx

Answer 2

Maybe it is clientaccesspolicy.xml problem. When the address of the site where SL is loaded is different from address where you want download data from, than it can be blocked. That clientaccesspolicy.xml file also must specify that SL can go deeper into subdirs. (here is some example).
Now I realize, that this problem would throw some cross domain policy error...
Either way, check that too, just to be sure.