I need to write a windows phone app that is compatible with both WP 7.5/7.8 and WP 8.
Now how do I have to setup my solution to target both platform?
I already create a class library for accessing data.
EDIT
How do i create a Windows Phone Projec that contains a version of the app compatible with WP7.X and another version compatible only with WP8 but having a single app on the store?