Request.UrlReferrer null?

Question

In an aspx C#.NET page (I am running framework v3.5), I need to know where the user came from since they cannot view pages without logging in. If I have page A

Answer 1

What you're looking for is best done with a query string variable (e.g. returnURL or originURL). Referrer is best used for data mining operations as it's very unreliable.

See the way ASP.Net does redirection with logins for an example.