web applications - Where on server to store user uploaded files in asp.net MVC 4 webapplication -

i have web-application built mvc 4, , want allow users upload files. of these files documents(pdf, word etc). decided store files on server in separated folders (folder per user) , have data in database on files on server. webapplication runs in windows azure (website - standard) environment.

i'm not sure whether should store user files in (standard mvc folder structure) content folder or app_data folder, or somewhere else.

help appreciated!