how get the full path of fileupload control

Question

i want to get the full path of fileupload control when the client upload the file i am use the Fileup1.PostedFile.FileName
 but it will give the short file name only,IN IE BROWSER IT WAS GIVE THE FULL PATH BUT IN FIREFOX NOT GIVE WHAT IS THE REASON..

I  use
System.IO.Path.GetFileName(Fileup1.PostedFile.FileName )
           

it 'S Always give c://program files//...   but the actual file loaction is d://mkr//...
           
how to get the full path of the fileupload control in asp.net IN FIRE FOX BROSER