static void Main()
        {
            object intList = MakeList(typeof(int), 1, 2, 3);
            object strList = MakeList(typeof(string), "sdfd", "fet");

            //List<int>
            foreach(object obj in (System.Collections.IEnumerable)intList)
                Console.WriteLine(obj);

            //List<string>
            foreach(object obj in (System.Collections.IEnumerable)strList)
                Console.WriteLine(obj);
        }

        static object MakeList(Type t, params object[] items)
        {
            Type type = typeof(List<>).MakeGenericType(t);

            object list = Activator.CreateInstance(type);
            System.Collections.IList ilist = list as System.Collections.IList;
            foreach (object o in items)
                ilist.Add(o);
            return list;
        }