Eleven

            using System.Collections;

            NameValueCollection NaVaCo = new NameValueCollection();
            NaVaCo.Add("test1", "1");
            NaVaCo.Add("test2", "2");
            NaVaCo.Add("test3", "3");
            NaVaCo.Add("test2", "4");

            foreach (var a in NaVaCo.GetValues("test2"))
            {
                Response.Write(a+" , ");
            }
//  此呈現   FIFO  先進先出


另一種hashTable  key 不可重復~!


            Hashtable hhh = CollectionsUtil.CreateCaseInsensitiveHashtable();
            hhh.Add("nicky17558", "1234");
            hhh.Add("12344", "2234");
            foreach (var a in hhh.Values)
            {
                Response.Write(a + " , ");
            }

//此為 後進先出  LIFO