Hashtable的使用

Hashtable mylist = new Hashtable();
            mylist.Add("1", "100");
            mylist.Add("2", "200");
            mylist.Add("3", "300");
            IDictionaryEnumerator myEnumerator = mylist.GetEnumerator();
            while (myEnumerator.MoveNext())
            {
               res += myEnumerator.Key + ":" + myEnumerator.Value+";";
            }