Arduino Serial Terminal for PC

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//The code belongs to the following tutorial video: https://youtu.be/rQTDD0bpNWE

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.IO.Ports;  //use the ports for serial communications (1)
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Threading;

namespace ArduinoSerialTutorial
{
    public partial class Form1 : Form
    {
        private SerialPort SerPort; //serial port
        private string ReceivedData; //received data




        public Form1()
        {
            InitializeComponent();

            FetchAvailablePorts(); //run the port-fetching
        }

        void FetchAvailablePorts()
        {
            String[] ports = SerialPort.GetPortNames();//Put the name of the available USB ports into the ports string array
            AvailablePortsBox.Items.AddRange(ports); //Add the string into the dropdown list we made
        }

        private void ConnectToPort_Click(object sender, EventArgs e)
        {
            //This is some predefined thing that you can get from Google
            SerPort = new SerialPort();
            SerPort.BaudRate = 9600;
            SerPort.PortName = AvailablePortsBox.Text;
            SerPort.Parity = Parity.None;
            SerPort.DataBits = 8;
            SerPort.StopBits = StopBits.One;
            SerPort.ReadBufferSize = 20000000;
            SerPort.DataReceived += SerPort_DataReceived;


            try
            {
                SerPort.Open(); //We open the port
                Thread.Sleep(1000); //We wait a sec

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error!");

            }
        }

        private void SerPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            ReceivedData = SerPort.ReadLine(); //We read the serial port

            this.Invoke(new Action(ProcessingData)); //execute the delegate (ProcessingData)
        }

        private void SendSerialButton_Click(object sender, EventArgs e)
        {
            SerPort.WriteLine(SenderTextBox.Text.ToString()); //send the content of the textbox to the serial port
        }

        private void ProcessingData()
        {
            ReceivedDataBox.Text += ReceivedData.ToString() + Environment.NewLine;
            //We put the received data in the textbox and add a linebreak

        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            try
            {
                SerPort.Close(); //close the port on from closing
            }
            catch
            {
            }
        }
    }
}