public RpcAuthentication(RpcCredentials credential)
        {
            _flavour = credential.AuthFlavour;

            MemoryStream ms = new MemoryStream();
            XdrDataWriter writer = new XdrDataWriter(ms);
            credential.Write(writer);
            _body = ms.ToArray();
        }
        public RpcAuthentication(RpcCredentials credential)
        {
            _flavour = credential.AuthFlavour;

            MemoryStream  ms     = new MemoryStream();
            XdrDataWriter writer = new XdrDataWriter(ms);

            credential.Write(writer);
            _body = ms.ToArray();
        }