Itâ€™s trivially simple to put an Image control onto a page in Windows Phone 7 and point it at a url. Handily, the Image control will also cache that URL, and not request it again for the life of your application. But what if youâ€™re like me and really, really want to save data traffic? I want that image to download once, ever. The only reason that Image control should generate data traffic would be if I reinstall my application.