You don't even really have to take it down, you could just add that line as the first line of code in the Page_Load method.
Or you could put a tag like this in the <head> section of your HTML:
- <META http-equiv="refresh" content="0;URL=http://bytes.com">
Either way it is up to you.
I'm sure that there is a way to configure IIS to do the redirects for you, but I'm not an expert there.