HTTPS for login

[GabeC]

I am working on a web application that about half the site is open to everyone. The rest of the site requires the user to login.

I understand how to make certain pages of my application require login using the web.config file but how to I change to secure communications for the login?

Ex.
The regular site is

http://www.mySite.com/default.aspx

The login page should be

https://www.mySite.com/login.aspx

I understand I need a security certificate to use SSL but how do I make just to login page require secure communications?

Thanks,

Gabe