//转成ASCII码
            string old = "jnf}mb|t?gWZMMIVO";
            char[] cs = old.ToArray();
           string temp="";
            foreach(char a in cs)
            {
                temp += ((int)a).ToString() + ",";
            }

            //换成字符
            string newstr="";
            string[] tp = temp.Split(',');           
             foreach(string st in tp)
             {
                 if(""!=st)
                 newstr += (char)(short.Parse(st));
             }