大端序发送数据

需要发送数字 151510

大端序发送就是 ：00 02 4F D6

 string smallData = textBox1.Text;//小端数据
            if (smallData == "")
            {
                MessageBox.Show("请输入初始里程", "错误",
                        MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                textBox1.Text = "";
                return;
            }
            if (!IsNumeric(smallData))
            {
                MessageBox.Show("初始里程必须是数字", "错误",
                        MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                textBox1.Text = "";
                return;
            }
            double doubleSmallData = Convert.ToDouble(smallData) * 10;
            int intSmallData = Convert.ToInt32(doubleSmallData);
            //int x = 439041118;  // 十六进制为 1A2B3C5E  intSmallData
            string s = null;
            byte[] b = BitConverter.GetBytes(intSmallData);
            s = BitConverter.ToString(b);
            textData = "01 0" + comboBox2.SelectedIndex + " 00 00 " + s + " ";
            retryCounts = 0;
            sendCounts = 0;
            bool result = sendMsg(textBox2.Text, textData);