Dictionary<string, object> a = new Dictionary<string, object>();

            a.Add("1",1111111111);

            a.Add("2", "AAAAAAAAAAAAAAAAAA");

            a.Add("3", new ArrayList() { "A","B","C"});


            foreach (KeyValuePair<string, object> item in a)
            {

                if (item.Value.GetType()==typeof(ArrayList))
                {
                    ArrayList list=(item.Value) as ArrayList;
                    for (int i = 0; i < list.Count; i++)
                    {
                        Console.WriteLine(list[i]);
                    }
                }
            }