openid in an app?
var s = new TwitterService("key", "secret");

// Step 1 - Retrieve an OAuth Request Token
OAuthRequestToken requestToken = s.GetRequestToken();

// Step 2 - Redirect to the OAuth Authorization URL
Uri uri = s.GetAuthorizationUri(requestToken);
Process.Start(uri.ToString());

// Step 3 - Exchange the Request Token for an Access Token
string verifier = Console.ReadLine(); //user types pin from website
OAuthAccessToken access = s.GetAccessToken(requestToken, verifier);

// Step 4 - User authenticates using the Access Token
s.AuthenticateWith(access.Token, access.TokenSecret);
var name = s.GetUserProfile().Name;
Console.WriteLine(name);