Login to ASP.net application via Google account

asp.net c#-4.0 authentication openid

Use OpenID. This is implemented in ASP.NET in the DotNetOpenAuth library. It includes samples for Google logins, and it's very easy.

The roles should work to. As you build up your user table, just add users to the appropriate roles.

asp.net c#-4.0 authentication openid

Have a look at this:

Scott Hanselman giving a quick overview of the OpenID features in .NET4.5. This might be a good starting point for you.

asp.net c#-4.0 authentication openid

I suggest you to take a look at this codeplex miniproject : http://loginwithgoogle.codeplex.com/.You might find it helpful.

Regards

CodeHunter