C#

I started to learn how to write mvc tests  from the following site http://www.asp.net/mvc/tutorials/older-versions/contact-manager/iteration-5-create-unit-tests-cs"

However when running the test I keep getting a object not set to instance exception  

 [TestMethod]
        public void CreateRace()
        {




            //Arrange

            RACE race = new RACE();

            race.RACE_CODE = 1;
            race.Logourl = "dasdad";
            race.RegattaCity = "Durban";
            race.RegattaProvince = "Kzn";
            race.RegattaStreetAddress = "232Chats";
            race.MAXPARTICA = 12;
            race.SECRETARY_EMAIL = "ssasda";
            race.SECRETARY_MOBILE = 1422434;
            race.SECRETARY_NAME = "jsjsjs";

            race.ENTRYAMOUNT = Convert.ToDecimal(23.58);

            race.EVENT_NAME = "sadada";
            race.status = "Active";
            race.UserId = 1;

            race.LATEENTRYAMOUNT = Convert.ToDecimal(23.58);

            string eventstart = "2014/05/12 12:02", eventend = "2014/05/17 12:02", entrydeadline = "2014/05/11 12:02", withdrawdate = "2014/05/11 12:02", YachtClubname = "durban";

            //Act
            var result = _service.CreateRace(race, eventstart, eventend, entrydeadline, withdrawdate, YachtClubname, "Kzn");




            //Assert

            Assert.IsTrue(result);
}

public bool CreateRace(RACE race, string eventstart, string eventend, string entrydeadline, string withdrawaldate,string YachtClubname,string Province )
      {

          if (!ValidateRace( race,eventstart,  eventend,  entrydeadline, withdrawaldate,YachtClubname,Province))
              return false;

          // Database logic
          try
          {
              _repository.CreateRace(race, eventstart, eventend,  entrydeadline, withdrawaldate,YachtClubname,Province);

          }
          catch
          {
              return false;
          }
          return true;
      }