Recieve Google Auth Refresh Token

RefreshToken.cs

var CLIENT_ID = "<YOUR CLIENT ID>";
var CLIENT_SECRET = "<YOUR CLIENT SECRET>";
var provider = new NativeApplicationClient(
    GoogleAuthenticationServer.Description,
    CLIENT_ID,
    CLIENT_SECRET);

IAuthorizationState state = new AuthorizationState(new[] { 
    "https://www.googleapis.com/auth/drive",
    "https://www.googleapis.com/auth/userinfo.email"
});

state.Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl);
var authUri = provider.RequestUserAuthorization(state);
var authUriString = authUri.ToString();
Clipboard.SetText(authUriString);
Console.Write(
    "Go to: {1}{1}{0}{1}{1}Then recieve and paste{1}",
    authUriString,
    Environment.NewLine);

Console.Write("Authorization Code: ");
var authCode = Console.ReadLine();
state = provider.ProcessUserAuthorization(authCode, state);
Clipboard.SetText(state.RefreshToken);
Console.Write("Your refresh token is: {0}", state.RefreshToken);

usings.cs

using System;
using System.Windows.Forms;
using DotNetOpenAuth.OAuth2;
using Google.Apis.Authentication.OAuth2;
using Google.Apis.Authentication.OAuth2.DotNetOpenAuth;