C# receive 接收的字符串 对比不相等的问题

//接收服务端消息，确认发送成功
            byte[] result = new byte[1];
            string str = \"a\";
            byte[] rstr = Encoding.UTF8.GetBytes(str);
            string newStr = Encoding.UTF8.GetString(rstr,0,str.Length).ToString().Trim();
            int reStr = PDASocket.Receive(result);
            string stringRtn = Encoding.UTF8.GetString(result, 0, result.Length).ToString().Trim();
            if (!string.IsNullOrEmpty(stringRtn))
            {
                label19.Text = stringRtn;
            }
            if (stringRtn == newStr)
            {
                sendLog = \"发送成功\";
            }
            else
            {
                sendLog = \"发送失败\";
            }