Exemplo Facebook SDK C# (teste)

HomeController.cs

using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Mvc;
using Facebook;

namespace MvcApplication1.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            dynamic parameters = new ExpandoObject();
            parameters.client_id = "31936308815862";
            parameters.redirect_uri = "http://localhost:49275/home/login_success";
            parameters.response_type = "code";
            parameters.display = "popup";

            // add the 'scope' parameter only if we have extendedPermissions.
            var extendedPermissions = "user_about_me,read_stream,publish_stream";
            if (!string.IsNullOrWhiteSpace(extendedPermissions))
            {
                // A comma-delimited list of permissions
                parameters.scope = extendedPermissions;
            }
            var _fb = new FacebookClient();
            var url = _fb.GetLoginUrl(parameters);

            return Redirect(url.ToString());

        }

        public ActionResult Login_success()
        {
            var _fb = new FacebookClient();
            FacebookOAuthResult oauthResult;
            //Pega o Code
            if (!_fb.TryParseOAuthCallbackUrl(Request.Url, out oauthResult))
            {
                //erro       
            }

            if (oauthResult.IsSuccess)
            {
                //Pega o Access Token "permanente"
                Dictionary<string, object> parameters = new Dictionary<string, object>();
                parameters.Add("client_id", "31936308815862");
                parameters.Add("redirect_uri", "http://localhost:49275/home/login_success");
                parameters.Add("client_secret", "722a67e46823d158b9ac4f01bc6492ccc");
                parameters.Add("code",oauthResult.Code);

                dynamic result = _fb.Get("/oauth/access_token", parameters);

                var accessToken = result.access_token;
                //Guardar no banco    


                //Exemplo de uso
                var client = new FacebookClient(accessToken);
                dynamic me = client.Get("me");


            }
            else
            {
                // user cancelled
            }
            return View();
        }

        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }
    }
}