File Field Control

I am having a HTML FileField Control on my ASP.net Page.
If I click the browse button and select a file, then hit the submit button, then it is working fine.
But however, If i input the just the file name and not the complete path (thats what i need to insert into the database), it seems like doing nothing when i hit the submit button.

I am using the filefield control not to upload the files but just as an alternative to openfiledialog .

Any suggestions would be helpful.
Thanks.