How to retrieve the current Directory and create a directory in it using VB code

[Ali Habib]

I am using common dialog control to get the file name, user wants to save. Also I have a text box in which the user can enter the filename manually. Incase the user enters the filename to be saved manually, how can I validate the filename and Directory using VB. Secondly if the directory path specified by the user doesnot exist , how can i create the directory structure through VB code. Finally how can I retrieve the curr Directory path, incase user only enter the filename.
I would greatly appreciate any help in this regard. Thanks

Ali.