Question Filtering scanned MAC address and display in textbox or listbox without duplication

[Aashram]

I am working on a tool that connected to my Bluetooth receiver and scan and get MAC address of BLE devices. So far I can scan and have the mac address continuously display in textbox. I am having problem with filtering MAC address?(Our assigned MAC address 88 99 66 55 4X XX the last 12 bit is free to use). How can I filter this while scanning and put it in Listbox or Textbox for later use.


Any suggestion or help will be appreciated.

using System;using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
using System.Text.RegularExpressions;
using System.Threading;






namespace Serial_Events
{
    public partial class Form1 : Form
    {
        //MessageSend comm = new MessageSend();
        string transType = string.Empty;


        public SerialPort serialport;
        private bool buttonWasClicked = false;


        
        public Form1()
        {
            InitializeComponent();


            foreach (string s in SerialPort.GetPortNames())
            {
                cmPort.Items.Add(s);
            }




        }


        public void serialport_connect(String port, int baudrate)
        {
            DateTime dt = DateTime.Now;
            String dtn = dt.ToShortTimeString();


            serialport = new SerialPort(port, baudrate);


            try
            {
                serialport.Open();


                textBox1.AppendText(" OPEN " + "[" + dtn + "] " + " Port Opened: Connected\n");


                // Event Handler
                serialport.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "Error");
            }
        }




        private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            


            DateTime dt = DateTime.Now;
            String dtn = dt.ToShortTimeString();
            //TextBox.CheckForIllegalCrossThreadCalls = false;
            if (buttonWasClicked == true)
            {
                ThreadSafeDelegate(delegate { ScanList.Items.Add(serialport.ReadExisting()); });
                //ThreadSafeDelegate(delegate { textBox3.Text += "\r\n"; });
            }
            else
            {
                ThreadSafeDelegate(delegate { textBox1.AppendText(serialport.ReadExisting()); });
                ThreadSafeDelegate(delegate { textBox1.Text += "\r\n"; });
                //textBox1.AppendText(serialport.ReadExisting());
                //textBox1.Text += "\r\n";
            }


         
        }
        private void button1_Click(object sender, EventArgs e)
        {


            byte[] msg = ASCIIEncoding.ASCII.GetBytes(textBox2.Text + "\0");


            serialport.Write(msg, 0, msg.Length);           
           


        }


        private void button2_Click(object sender, EventArgs e)
        {
            String port = cmPort.Text;
            int baudrate = Convert.ToInt32(cmBaud.Text);
            //Parity parity = (Parity)Enum.Parse(typeof(Parity), cmbparity.Text);
            //int databits = Convert.ToInt32(cmbdatabits.Text);
            //StopBits stopbits = (StopBits)Enum.Parse(typeof(StopBits), cmbstopbits.Text);
            button3.Enabled = true;
            serialport_connect(port, baudrate);


        }


        private void button3_Click(object sender, EventArgs e)
        {
            DateTime dt = DateTime.Now;
            String dtn = dt.ToShortTimeString();


            if (serialport.IsOpen)
            {
                serialport.Close();
                button3.Enabled = false;
                button2.Enabled = true;
                textBox1.AppendText("[" + dtn + "] " + "Port Close: Disconnected\n");
            }
        }
        
        private void btnClear_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
        }


        private void ThreadSafeDelegate(MethodInvoker method)
        {
            if (InvokeRequired)
                BeginInvoke(method);
            else
                method.Invoke();
        }


        private void Scan_Click(object sender, EventArgs e)
        {
            buttonWasClicked = true;


            byte[] msg = ASCIIEncoding.ASCII.GetBytes( "SNS10" + "\0");


            serialport.Write(msg, 0, msg.Length);
        }
    }
}