C# Base64 转字节 字节转普通字符串

        static void Main(string[] args)
        {
            string s = "dv=1111102101280002&bid=3223121060100058,3223121060100059,3223121060100789,3223121030100538&soc=99,100,88,65&ds=0,0,0,0&ram=123456";
            Console.WriteLine(s);
            byte[] payload = Encoding.Default.GetBytes(s);
            String payloadStr = Convert.ToBase64String(payload);
            Console.WriteLine(payloadStr);
            var bylst = Convert.FromBase64String(payloadStr);
            var iss= System.Text.Encoding.Default.GetString(bylst);
            Console.WriteLine(iss);
            Console.Read();
        }