C# İki Tarihin Arasındaki Farkı Saniye Cinsinden Almak

Merhaba arkadaşlar bir jquery ile Final Count Down yapmak gerekti

http://www.gieson.com/Library/projects/utilities/countdown/

şu adresteki olay baya iyi iki tarih arasındaki farkı saniye cinsinden alıp propery ile

-------------------------- Javascript Kodu----------------------
                                var CountdownLabels = {
                                    ms: "MİLİSANİYE",
                                    second: "SANİYE",
                                    minute: "SAKİKA",
                                    hour: "SAAT",
                                    day: "GÜN",
                                    month: "AY",
                                    year: "YIL"
                                };

                                var myCountdown1 = new Countdown({
                                    time: <%=Dakika %>, // 86400 seconds = 1 day
                                    width: 300,
                                    height: 60,
                                    rangeHi: "day",
                                    style: "flip"    // <- br="" comma="" item="" last="" no="" on="">                                });

-------------------------- Propery C# ------------------------

        public string Dakika
        {
            get
            {

                DateTime dt1 = new DateTime(2016, 06, 15, 23, 59, 59);

                TimeSpan tarih = dt1.Subtract(DateTime.Now);
                return Convert.ToInt32(tarih.TotalSeconds).ToString();

            }

        }