Google Account login Integration for android Xamarin

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C#3.5

Xamarin

OAuth2

I need to integrate google login to android xamarin application. gone through the code from bellow link: http://motzcod.es/post/67077106339/google-plus-services-login-and-1-in-xamarin-android

it shows the error connection failed and [GooglePlayServicesUtil] Google Play Store is missing. even ofter adding google play service(Froyo) component.

even i gone through the bellow links https://developers.google.com/+/mobile/android/sign-in

Android: Login using google account?

Google Login For Android App

but this is related to android eclipse using java code. can anybody suggest me how to do this in xamarin. any hints/links are appreciated. thank you.