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;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            button2.Enabled = true;


            string[] ports = SerialPort.GetPortNames();

            foreach (string port in ports)
            {
                comboBox1.Items.Add(port);
            }

        }

        string t;
        private void button2_Click(object sender, EventArgs e)
        {
            t = comboBox1.Text.ToString();
            SErial(t);
        }

        SerialPort sp;

        void SErial(string name_port)
        {

            sp = new SerialPort(name_port, 9600, Parity.None, 8, StopBits.One);

            sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
        }


        void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
        {
            throw new NotImplementedException();
            sp.Open();
            string w = sp.ReadLine();
            if (w != string.Empty)
            {
                Invoke(new Action(() => richTextBox1.AppendText(w)));//وضع البيانات فيrichTextBox1 
                sp.Close();

            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }


    }
       
    
    }

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;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            button2.Enabled = true;


            string[] ports = SerialPort.GetPortNames();

            foreach (string port in ports)
            {
                comboBox1.Items.Add(port);
            }

        }

        string t;
        private void button2_Click(object sender, EventArgs e)
        {
            t = comboBox1.Text.ToString();
            SErial(t);
        }

        SerialPort sp;

        void SErial(string name_port)
        {

            sp = new SerialPort(name_port, 9600, Parity.None, 8, StopBits.One);

            sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
            sp.Open();
        }


        void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
        {
          // throw new NotImplementedException();  /no need to throw
            
            string w = sp.ReadLine();
            if (w != string.Empty)
            {
                Invoke(new Action(() => richTextBox1.AppendText(w)));//وضع البيانات فيrichTextBox1 
               

            }
           
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }


    }
       
    
    }