Banning a domain from an IIS site?

Can this be done by a newbie such as myself?

[wintercornuk]

I signed up for a news feed from a well known British Broadcasting Corporation a few months ago. I have since decided not to use it, but they are constantly appearing on my site, sometimes several times a day. This fills my logs with their various spiders.

I run a site on IIS, can I ban/bounce them somehow?

[Staffa]

Have you put their UA in your robots.txt file with Dissallow?

[digitalv]

You can ban their IP address in IIS, but it would be just as easy to do a redirect with ASP. Send them back to their own page :)

...

If request.servervariables("REMOTE_ADDR") = "their.IP.Address.number" Then
response.redirect "http://www.theirdomain.com"
End If

Let them spider their own site.

[wintercornuk]

The problem is that the spider is not a spider, or at least doesn't seem to be. It only shows a subdomain/domain.

Can robots.txt be used to ban by domain/IP?

I also don't have access to the raw ASP pages as I'm using a hosted cart.