how to know the worksheet name without opening it in vb.net

hello everybody
This is shailendra.
I have some problem regarding excel and vb.net.
I want to know the worksheet name of a excel file .Its the situation that i know the excel file name but each time the sheet name changes ex-bhav_copymmddyyyy or dd.mm.yyyy and much more.
Plz help me
[email]Shailendra_shail@indiatimes.com[/email]

you can try to use excel object in VB.NEt.. then you will be able to get the sheet name dynamically...