How to capture the useful part of url in my aspx site

I already managed to get the asp.net intranet site url to label1.text for a particular page (there are many pages like this)
So it may be like this
http://CompanyABC/Intranet/FinalNews.aspx?NewsID=23
But since this app has alias, some user use old path name like this
http://Company/Portal/FinalNews.aspx?NewsID=23

I only want to capture FinalNews.aspx into label2.text
What is the text function for this ? How to find the last "/" ?
Thanks