What exactly are you trying to accomplish? I'm having a hard time understanding when this would be useful.
If you're trying to simplify file creation during development, then you should probably not be using a web page as your tool. You should consider a VS macro or template or some other IDE-focused process.
If you want end users to create new content, you might consider using a pre-existing Content Management Solution or storing content in the database and retrieving it via a single dynamic page (e.g. Content.aspx or something). This way you don't have to worry about users creating filenames with invalid names, or duplicate files, or anything like that.
Is there a particular reason you want to use a web page to modify your project files?