Application.GetResourceStream called on a Content Resource still return null

Question

Here is the task-related part of the VS2010 project (Windows Phone) structure:

Answer 1

The path supplied Application.GetResourceStream isn't relative to the position of the class, but relative to the application package.

StreamResourceInfo albumArtPlaceholder = 
    Application.GetResourceStream(
        new Uri("Images/artwork.placeholder.png", UriKind.Relative));

Would be the correct path. You can also try with a full pack URI. (see MSDN)

And finally, Resource would be the correct Build Action for this.