Hallo, I'm migrating to dnn an old classic asp news site with several thousands of articles (around 50/60k) so I don't want to loose the links we gathered in all this time.

What I'm going to do is write an HttpModule that check if the requested url is "myoldsitepath.asp?", read the querystring to extract article ID, lookup to a simple db table with oldid > newurl match and makes a permanent redirect to the new dnn url.

Since I'm a total newbie to DNN I just wanted to know if there is some built-in class to exploit for this task, any suggestion on which event to attach the module and such. I don't want/need to create a dnn package for that, manually registering it in web.config will be ok.

Thank you Joe you are always helpful to me! And thank you Sebastian my saviour ;)

I can't wait to start some module development, I'm really in love with DNN since I discovered it. 
At the moment I was a bit in hurry so I wrote a custom httpmodule without resorting to DNN classes. It's quite simple and if it finds the correct conditions does a db lookup on an integer (clustered primary key) column with article id and retrieves the new url.

It uses ado datareader it should be quite fast... after all losing all the links since 7 years would be a sucide... I just hope Google won't hit much hard on us :)))