端口中的C#二进制数据转换为十六进制字符串

我找到了一个源代码，并对其进行了一点更改，这样我就可以从com6上的接收器中检索数据。我收到的数据是二进制的。现在我想把它转换成一个十六进制字符串。如果它是一个十六进制字符串，我们可以切割字符串的一部分并分别解码。我该怎么做？

以下是代码：

using System;
using System.IO.Ports;
using System.Threading;
public class PortChat
{
    static bool _continue;
    static SerialPort _serialPort;
    public static void Main()
    {
        string name;
        string message;
        StringComparer stringComparer = StringComparer.OrdinalIgnoreCase;
        Thread readThread = new Thread(Read);
        // Create a new SerialPort object with default settings.
        _serialPort = new SerialPort();
        // Allow the user to set the appropriate properties.
        _serialPort.PortName = SetPortName(_serialPort.PortName);
        _serialPort.BaudRate = SetPortBaudRate(_serialPort.BaudRate);
        _serialPort.Parity = SetPortParity(_serialPort.Parity);
        _serialPort.DataBits = SetPortDataBits(_serialPort.DataBits);
        _serialPort.StopBits = SetPortStopBits(_serialPort.StopBits);
        _serialPort.Handshake = SetPortHandshake(_serialPort.Handshake);
        // Set the read/write timeouts
        _serialPort.ReadTimeout = 1000;
        _serialPort.WriteTimeout = 1000;
        _serialPort.Open();
        _continue = true;
        readThread.Start();
        Console.Write("Name: ");
        name = Console.ReadLine();
        Console.WriteLine("Type QUIT to exit");
        while (_continue)
        {
            message = Console.ReadLine();
            if (stringComparer.Equals("quit", message))
            {
                _continue = false;
            }
            else
            {
                _serialPort.WriteLine(
                    String.Format("<{0}>: {1}", name, message));
            }
        }
        readThread.Join();
        _serialPort.Close();
    }
    public static void Read()
    {
        while (_continue)
        {
            try
            {             

                string message = _serialPort.ReadLine();
                Console.WriteLine(message);
            catch (TimeoutException) { }
        }
    }
    public static string SetPortName(string defaultPortName)
    {
        string portName;
            portName = "COM6";
        return portName;
    }
    public static int SetPortBaudRate(int defaultPortBaudRate)
    {
        string baudRate;

        baudRate = "9600";
        return int.Parse(baudRate);
    }
    public static Parity SetPortParity(Parity defaultPortParity)
    {
        string parity;
        parity = "None";
        return (Parity)Enum.Parse(typeof(Parity), parity);
    }
    public static int SetPortDataBits(int defaultPortDataBits)
    {
        string dataBits;
        dataBits = "8";
        return int.Parse(dataBits);
    }
    public static StopBits SetPortStopBits(StopBits defaultPortStopBits)
    {
        string stopBits;
        stopBits = "One";
        return (StopBits)Enum.Parse(typeof(StopBits), stopBits);
    }
    public static Handshake SetPortHandshake(Handshake defaultPortHandshake)
    {
        string handshake;
        handshake = "None";
        return (Handshake)Enum.Parse(typeof(Handshake), handshake);
    }
}

    string Data = "123";
    string hex = "";
    foreach (char c in Data)
    {
        hex += String.Format("{0:x2}", (byte)c);
    }