On the server there are always virtual directory where your website is hosted. so nobody will provide you the absolute path of your application(for security reason). what you need to do is, just use relative path from the root directory of your folder. To upload any of the file you can use either database to store or create one temporary directory inside your given area.
Actually i do not have much idea about VB rocks but this is the general scenario. and it may also apply in your case.
Go through some tutorial for relative paths in your language. and best of luck