how to implement OpenID via c#

I want to implement a lo开发者_如何学Pythongin system by using openid (for login with google, yahoo) for asp.net and asp.net mvc applications, I search over the Internet (and googled that and also stacked :D) but, there is nothing to guide me to implement this; all pages was about libraries (DotNetOpenId, DotNetOpenAuth, etc); can anybody help me to understanding and implementing this? without other libraries? thanks.

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check this out: http://www.dotnetopenauth.net/

Edit: Just re-read and you said no libraries.

Maybe these links will help you out: http://oauth.net/documentation/getting-started/

This one has a specifications link: http://openid.net/developers/