禁止外部访问某个目录

http://blog.csdn.net/happymagic/article/details/6775415
http://bbs.csdn.net/topics/300079273

<location path="UploadFiles/PublicFiles">
<system.web>
<authorization>
<!--阻止所有用户访问-->
<deny users="*"/>
</authorization>
</system.web>
</location>