Fetch All Google Contacts - Asp.net web form

1 - Download and open the project in Visual Studio. 2 - Before compiling a code, please create an app on Google-Contacts API if you haven't created one. 3 - TO create an app on Google-Contacts API follow the steps on https://developers.google.com/google-apps/contacts/v3/ 4 - Get the Client ID, Client secret Key and pp name from the app you just created. 5 - Go back to Visual Studio and open web.config file 6 - Edit the web.config fields with the respective data that is client id, secret key and app name. 7 - put the redirect url what you have given on app, it should be page url where you want google to redirect user after authentocation.