Does anyone here know a little C#

private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            if (textBox1.InvokeRequired)
            {
                textBox1.BeginInvoke(new Action<object, System.IO.Ports.SerialDataReceivedEventArgs>(serialPort1_DataReceived), sender, e);
            }
            else
            {
                byte []buff = new byte[serialPort1.BytesToRead];
                serialPort1.Read(buff, 0, buff.Length);
                textBox1.Text = "New Data: " + BitConverter.ToString(buff);
            }
        }

using System;
using System.IO;

namespace BoilerEventAppl
{

    // boiler class
    class Boiler
    {
        private int temp;
        private int pressure;
        public Boiler(int t, int p)
        {
            temp = t;
            pressure = p;
        }

        public int getTemp()
        {
            return temp;
        }
        public int getPressure()
        {
            return pressure;
        }
    }
    // event publisher
    class DelegateBoilerEvent
    {
        public delegate void BoilerLogHandler(string status);

        //Defining event based on the above delegate
        public event BoilerLogHandler BoilerEventLog;

        public void LogProcess()
        {
            string remarks = "O. K";
            Boiler b = new Boiler(100, 12);
            int t = b.getTemp();
            int p = b.getPressure();
            if (t > 150 || t < 80 || p < 12 || p > 15)
            {
                remarks = "Need Maintenance";
            }
            OnBoilerEventLog("Logging Info:\n");
            OnBoilerEventLog("Temperature " + t + "\nPressure: " + p);
            OnBoilerEventLog("\nMessage: " + remarks);
        }

        protected void OnBoilerEventLog(string message)
        {
            if (BoilerEventLog != null)
            {
                BoilerEventLog(message);
            }
        }
    }
    // this class keeps a provision for writing into the log file
    class BoilerInfoLogger
    {
        FileStream fs;
        StreamWriter sw;
        public BoilerInfoLogger(string filename)
        {
            fs = new FileStream(filename, FileMode.Append, FileAccess.Write);
            sw = new StreamWriter(fs);
        }
        public void Logger(string info)
        {
            sw.WriteLine(info);
        }
        public void Close()
        {
            sw.Close();
            fs.Close();
        }
    }
    // The event subscriber
    public class RecordBoilerInfo
    {
        static void Logger(string info)
        {
            Console.WriteLine(info);
        }//end of Logger

        static void Main(string[] args)
        {
            BoilerInfoLogger filelog = new BoilerInfoLogger("d:\\boiler.txt");
            DelegateBoilerEvent boilerEvent = new DelegateBoilerEvent();
            boilerEvent.BoilerEventLog += new DelegateBoilerEvent.BoilerLogHandler(Logger);
            boilerEvent.BoilerEventLog += new DelegateBoilerEvent.BoilerLogHandler(filelog.Logger);
            boilerEvent.LogProcess();
            Console.ReadLine();
            filelog.Close();
        }//end of main

    }//end of RecordBoilerInfo
}

            boilerEvent.BoilerEventLog+= Logger;
            boilerEvent.BoilerEventLog+= filelog.Logger;