Google login and registration in asp.net application

Question

I am developing an asp.net web application in vs2008 framework 3.5.I need to use google login and registration in my site.Please tel me whether i should use any api ?Is there any ways to extract the sign in information from the user who is using my site? My intention is to create login like that in http://www.plaxo.com/.

Answer 1

You need to use OpenId, dotnetopenauth should serve your purpose.

This article, although for MVC, should explain to you how to use DotNetOpenAuth.