Retrieve Gmail contacts using C#

Question

Hi. 

 I want to retrieve the Gmail contacts in my windows application. i google it. i got plenty of topics. in that they told use OAuth.v2.0. I created the project, got the client id, secret id. but i dont know how to use the code they given. and where i want to use that. 

 

i need the full detailed code from your side. i dont know how explain.  

 

thanks in advance.