How to Handle Facebook Application Requests?

Question

I am working on a Facebook application And I am offering the user to invite his friend to the application using the C# SDK. as shown in Facebook documentation

My p

Answer 1

In case if you are using http://facebooksdk.codeplex.com/ with MVC3 at the app main page controller you should provide redirection for non-authorized users:

var fbWebContext = FacebookWebContext.Current;
if (fbWebContext.IsAuthorized() && fbWebContext.UserId > 0)
{
    try
    {
        var fb = new FacebookWebClient(fbWebContext);
        dynamic result = fb.Get("/me");
    }
    catch (FacebookOAuthException)
    {
        var redirectString = string.Format("https://graph.facebook.com/oauth/authorize?client_id={0}&redirect_uri={1}&type=user_agent&display=page&scope={2}",
                                 Facebook.FacebookApplication.Current.AppId,
                                 FacebookWebContext.Current.Settings.CanvasPage,
                                 "email, publish_actions"
                             );
        Response.Redirect("redirectString");
    }
}