System.Collections

  static void DumpPrimitiveList()
        {
            List<int> list = new List<int>();
            list.Add(5);
            list.Add(10);
            list.Add(15);
            list.Add(20);
            foreach (int i in list)
                Console.WriteLine(i);
            Console.ReadLine();
        }

        static void DumpDictionary()
        {
            Dictionary<string, int> dict = new Dictionary<string, int>();
            dict.Add("Key1", 5);
            dict.Add("Key2", 10);
            dict.Add("Key3", 15);
            dict.Add("Key4", 20);
            Dictionary<string,int>.Enumerator enumerator = dict.GetEnumerator();
            while (enumerator.MoveNext())
                Console.WriteLine(string.Format("Key : {0} Value : {1}", enumerator.Current.Key, enumerator.Current.Value));
            Console.ReadLine();
        }