Question

I have a login.asp page. Whenever the session expires, the user is given a link to the login page to log in. After logging in, users need to go back to the original page from which the link was clicked. How do I get the address of that webpage?

Answer 1

You could redirect him to

/login.asp?next=url-of-where-the-user-tried-to-go

Once he logs in, redirect him to the parameter next. This is extremely common.