We implement OpenID in our company so that the only trusted openid provider is our own. Because of this, the user does not need to use anything to enter the site. They simply click on the login button and are taken to the main login site. If they are already logged in, he instantly sends them back to the site, and they authenticate. If they have not logged in yet, he will ask them to authenticate.
While we do not use .Net, we use several languages (the most common are Python and PHP) and many open source frameworks (Django, Drupal, Wordpress among others), and we really brought our code back to these communities as plugins open source.
My friend, who is a .NET developer, uses OpenID in his application, so I know that the code for this already exists and is available.
newz2000
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