Facebook.FacebookOAuthClient.GetLoginUrl C# (CSharp) Method

        public static Uri GetLoginUrl(string appId, Uri redirectUri, string[] extendedPermissions, bool logout, IDictionary<string, object> loginParameters)
        {
            Contract.Requires(!string.IsNullOrEmpty(appId));
            Contract.Ensures(Contract.Result<Uri>() != null);

            var oauth = new FacebookOAuthClient { AppId = appId, RedirectUri = redirectUri };

            var defaultLoginParameters = new Dictionary<string, object>
                                             {
                                                 { "response_type", "code" }, // make it "code" by default for security reasons.
#if WINDOWS_PHONE
                                                 { "display", "touch" }
#else
                                                 { "display", "popup" }
#endif
                                             };

            if (extendedPermissions != null && extendedPermissions.Length > 0)
            {
                defaultLoginParameters["scope"] = string.Join(",", extendedPermissions);
            }

            var mergedLoginParameters = FacebookUtils.Merge(defaultLoginParameters, loginParameters);

            var loginUrl = oauth.GetLoginUrl(mergedLoginParameters);

            Uri navigateUrl;
            if (logout)
            {
                var logoutParameters = new Dictionary<string, object>
                                           {
                                               { "next", loginUrl }
                                           };

                navigateUrl = oauth.GetLogoutUrl(logoutParameters);
            }
            else
            {
                navigateUrl = loginUrl;
            }

            return navigateUrl;

        }

        /// <summary>
        /// Get FacebookOAuthClient.
        /// </summary>
        void MainPage_Loaded()
        {
            using (DbStorage fbdb = new DbStorage(strConnectionString))
            {
                IQueryable<Db> fbQuery = from db in fbdb.user select db;
                Db ac = fbQuery.FirstOrDefault();
                if(ac == null){
                    string appId = "YOUR FACEBOOK APP ID";
                    string[] extendedPermissions = new[] { "publish_stream"};

                    var oauth = new FacebookOAuthClient { AppId = appId };
                    var parameters = new Dictionary<string, object>
                            {
                               { "response_type", "token" },
                                { "display", "touch" }
                            };
                    if (extendedPermissions != null && extendedPermissions.Length > 0)
                    {
                        var scope = new StringBuilder();
                        scope.Append(string.Join(",", extendedPermissions));
                        parameters["scope"] = scope.ToString();
                    }
                    var loginUrl = oauth.GetLoginUrl(parameters);
                    //Add webBrowser to the contentPanel
                    _webBrowser.Navigate(loginUrl);
                    ContentPanel.Children.Add(_webBrowser);
                    _webBrowser.Navigated += webBrowser_Navigated;
                    //Open the facebook login page into the browser
           
            }
        }
        }