How to show maintenance page during deployment?

Question

I want to plan a schedule maintenance down time on one of my production asp.net website hosted on IIS windows server 2003.

I think this is the preferred behavior:

1. All request to http://www.x.com including www.x.com/asb/asd/ will be redirected to a notification page (site is currently down. come back later)
2. The maintenance will take around an hour. how do I ensure for having this redirection to maintenance page to have the least impact to SEO/google ranking
3. Preferrably I want to be able to quietly test the production site before it goes back 'live'
4. Preferrably I dont want to rely on pointing DNS elsewhere.
5. To make it simple please pretend that I don't have any other hardware in front of the web servers (i.e load balancer, firewall etc)

An idea would be:

1. to create another app on the same web server
2. create httpmodule or httphandler to handle any url request and 302 redirect them to the maintenance page

Thanks

Answer 1

copy an app_offline.htm file to the webroot

http://weblogs.asp.net/scottgu/archive/2005/10/06/426755.aspx

Answer 2

Try putting App_Offline.htm to the root directory.