web api cors for api in app_code of .net website developed in .net framework 4.0

hi

     i developed my web api in the app_code folder of my asp.net web site(not MVC architecture) built on .net framework 4.0. now i have a separate single page application built using angular js and HTML which will convert into phonegap mobile app.I want to use that Api as server side.So how will we make that cross origin request. I checked various things on google but they says cors is only for .net framework 4.5.plz help

Thanks in advance