Save Image to Windows Phone Camera Roll

I am having a certain feature in my game, which is being made for WIndows8 phones, where you can save a render texture image to your phone. The thing is working well till the point of the render texture getting encoded to PNG. In fact, it runs and saves a PNG image perfectly when simulated in Unity on the development machine, as well as when built for Windows8 PC. But when I try to save it while testing on the Mobile, nothing happens. No image is found, no debug error log, no hang ups, nothing.

The path I have given to save the file is Application.dataPath . I can't really find the path to save it in camera Rolls on the web.

Could someone suggest a code line or the exact path where my file should be saved on the phone to be available for viewing through Camera Roll or Gallery?

Thanks and Cheers! Shashank