gistfile1.txt

        public FacebookClient(string appSecret, string appId)
        {
            SendAnalytics();
        }

        private static bool AnaltyicsSent = false;
        private static object AnalyticsLock = new object();
        private void SendAnalytics()
        {
            System.Threading.Tasks.Task.Factory.StartNew(() =>
            {
                try
                {

                    if (!AnaltyicsSent)
                    {
                        lock (AnalyticsLock)
                        {
                            if (!AnaltyicsSent)
                            {
                               
                                // Make call
                            }
                        }
                    }
                }
                catch { }
            });
        }