How do I Force HTTPS when user types HTTP in URL (IIS server, ASPX)

[Anonieko]

A solution

1. Add a certificate in the site. Check Required SSL
(Right click web site->properties->Directory Security->Server
Communcations->Edit

2. In IIS manager, right click on virtual directory (or site)

In Custom Errors, change mapping or http error 403.4 to point to a
aspx page.

That aspx page should unconditionally redirect to https url (you
can also use javascript here).

 

[Mark Rae]

A solution

A much better solution:
http://www.codeproject.com/aspnet/WebPageSecurity_v2.asp?select=1697847&df=100&forumid=53615&exp=0