在文件服务器或数据库中存储文件？

I'm developing some web app in ASP.Net which is mainly about Storing, Sharing and Processing MS Word doc and PDF files, but I'm not sure how to manage these documents, I was thinking of keeping documents in folders and only keeping metadata of them in DB OR keeping the whole documents in DB,I'm using SQL Server 2008. what's your suggestion? I'm developing some web app in ASP.Net which is