Code to redirect unwanted page requests before they are served - asp.net

This is a quick and simple job for someone with more skill than me. I am having a problem with large numbers of (fake) direct page requests to our website(s). The fake requests have 100% bounce rate and 00 dwell time. The requests share the following characteristics in Google Analytics - user-agent undefined - no browser version - no OS - no location To deal with the problem, I need some simple code written in vb that 1) tests for the presence of one or more of these conditions on every page request (user agent would be particularly good) 2) if the conditions are met, [login to view URL] to another page (let's say [login to view URL] !) before the page is served. Otherwise, serves the request as normal. I need you to verify that the code works and will precisely target this condition.