How do sites like stackoverrflow using the third party login id, to login to the site?

Posted by Ayyappan.Anbalagan on Stack Overflow See other posts from Stack Overflow or by Ayyappan.Anbalagan
Published on 2010-06-11T18:26:29Z Indexed on 2010/06/11 18:32 UTC
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How the sites like stackoverrflow using the third parthy login id(gmail,blogspot), to login the site?

How to do this in asp.net? Give me a idea to implement this in to my application.

i don't have idea from where. I have to start this.

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