您正在寻找OpenID。请参阅 http://www.fryan0911.com/2010/ 09 / use-google-openid-authentication-in.html 。

I have an asp.net website with login form and I want every visitors can able to login into my website using their gmail account....

Is there any one who can assist me on this or send some examples for the same?

Thanks Hitesh

You are looking for OpenID. See http://www.fryan0911.com/2010/09/use-google-openid-authentication-in.html.