get the values from IE..

hi friends...

i want to get the internet explorer address bar values to a textbox in .net..
(EX. www.ff.com)

after i got that IE values  then i want to check that address with my coding..
i am doing my application in vb.net..

if that address is there means IE will be closed with a message.

how to do that...

i want coding for that..

its urgent..

thanx .
regards
gopal