How to authenticate user using Google.GData.Apps of .net

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C#

google-app

I am using google provisioning api on my website. I created a domain on google and some users. Now I want to authenticate them using AppsService class.

AppsService service = new AppsService("domain", "admin username", "admin password");

     UserEntry user = service.RetrieveUser("username");

These two lines I found everywhere. But I want to authenticate user with his username and password.