สอบถามปัญหา Visual C# ครับ จะเขียนให้รับค่า .HEX ของ JPEG ได้มั้ยครับ

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using MySql.Data.MySqlClient;

namespace project2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            CheckForIllegalCrossThreadCalls = false;
        }
        private string Connection = "Server=localhost;User Id=root; Password=pp34999; Database=monitora; Pooling=false";
        private void Form1_Load(object sender, EventArgs e)
        {
            string[] Portnames = SerialPort.GetPortNames();
            foreach (string n in Portnames)
            {
                comboBox1.Items.Add(n);
            }
            comboBox1.SelectedIndex = 0;
            timer1.Start();
        }

        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            textBox1.AppendText(serialPort1.ReadLine());
            //textBox1.Text = serialPort1.ReadExisting();
            MySqlConnection Con = new MySqlConnection(Connection);
            Con.Open();
            string sql = "INSERT INTO monday(rfid,date,time)";
            sql += "VALUES ('" + textBox1.Text + "','" + label1.Text + "','" + label2.Text + "')";
            MySqlCommand cmd = new MySqlCommand(sql, Con);
            cmd.ExecuteNonQuery();
            Con.Close();
            textBox1.Clear();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            serialPort1.PortName = comboBox1.SelectedItem + "";
            //serialPort1.PortName = comboBox1.Text;
            serialPort1.Open();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            label2.Text = DateTime.Now.ToLongTimeString();
            label1.Text = DateTime.Now.ToLongDateString();
        }
    }
}