Hi I tried filling a Hashtable in the following way:

      ResearchCourse resCourse= new ResearchCourse();//Class Instance
      resCourse.CID="RC1000";
      resCourse.CName="Rocket Science";

      TaughtCourse tauCourse= new TaughtCourse();//Class Instance
      tauCourse.CID="TC1000";
      tauCourse.CName="Marketing";

      Hashtable catalog = new Hashtable();

        catalog.Add("1", "resCourse.CID");
        catalog.Add("2", "tauCourse.CID");


        foreach (DictionaryEntry de in catalog)
        {
            Console.WriteLine("{0}, {1}", de.Key, de.Value);
        }

Output Result to Console was:

1, resCourse.CID
2, tauCourse.CID

Expected Result to be:

1, RC1000
2, TC2000

What am I misunderstanding about Hashtables?
What is an easy way for the Hashtable to store the class instance and its values?