if then else - check url + swap image... ?

I come from the land of PHP... now working on an online store that runs asp.net for it's structure.
I have used PHP in the past to reference a url and swap images for the navigation, change meta tags, etc... Is their an easy in-line script that can do this with ASP?
I want to reference the URL of the current page, and change the headder image to something else, if the URL matches... On about 10 different pages... every other page will use the 'else' statement to load the default/home image...


Should be pretty easy, right? Any ideas?  


Thanks!
Sean 
...