Creating a hidden folder

Not to say that there is not a way to do this but the Directory and DirectoryInfo classes do not have a way to set the attributes on the directory you can set the ACL for security purposes but that is something different.

Don't exactly know why you are trying to create a hidden directory but you may want to read some on IsolatedStorage if you want to ensure that something can be utilized by your app securely.

http://www.developer.com/net/net/article.php/3430541