C# Desktop application. Simple example how to upload a file to Google Drive

Is there any code example of a desktop application how to authorize to Google Drive service and upload a file?

Currently I have:

var parameters = new OAuth2Parameters
                                 {
                                     ClientId = ClientCredentials.ClientId,
                                     ClientSecret = ClientCredentials.ClientSecret,
                                     RedirectUri = ClientCredentials.RedirectUris[0],
                                     Scope = ClientCredentials.GetScopes()
                                 };    
string url = OAuthUtil.CreateOAuth2AuthorizationUrl(parameters);
    // Open url, click to allow and copy secret code
    parameters.AccessCode = secretCodeFromBrowser;
    OAuthUtil.GetAccessToken(parameters);
    string accessToken = parameters.AccessToken;
    // So, there is the access token

But what are the next steps? As I see from examples I should get IAuthenticator instance and pass it into constructor of DriveService class... How to get an instance of IAuthenticator? If my above code is correct... Thanks in advance.