BackgroundWorker Updating Progressbar Example With Log

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;
namespace sampleBackgroundWorker
{

    public partial class Form1 : Form
    {

        private BackgroundWorker worker = new BackgroundWorker();
        private DataTable data = new DataTable();
        private delegate void DelegateMethod(object[] args);

        private StreamWriter writer;

        public Form1()
        {
            InitializeComponent();
            worker.WorkerReportsProgress = true;
            worker.DoWork += new DoWorkEventHandler(worker_DoWork);
            worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
            worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
            saveFileDialog1.Filter = "Log Files|*.log|All Files|*.*";
            if (saveFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                writer = new StreamWriter(File.Open(saveFileDialog1.FileName, FileMode.Append));
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "DAT Files|*.dat|All Files|*.*";
            if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                worker.RunWorkerAsync(openFileDialog1.FileName);
            }
        }

        void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            try
            {
                BinaryReader reader = new BinaryReader(File.Open(e.Argument.ToString(), FileMode.Open));
                setupProgressBar(new object[] { (int)reader.BaseStream.Length });
                int columnCount = reader.ReadInt32();

                data.Columns.Add("Date Time");
                for (int i = 0; i < columnCount; i++)
                {
                    data.Columns.Add(new string(reader.ReadChars(reader.ReadInt32())));
                    worker.ReportProgress((int)reader.BaseStream.Position);
                }

                bool eof = false;
                while (!eof)
                {
                    try
                    {
                        List<object> RowData = new List<object>();
                        RowData.Add(reader.ReadInt32());
                        for (int i = 0; i < columnCount; i++)
                        {
                            RowData.Add(reader.ReadSingle().ToString());
                            worker.ReportProgress((int)reader.BaseStream.Position);
                        }
                        data.Rows.Add(RowData.ToArray());
                        worker.ReportProgress((int)reader.BaseStream.Position);
                    }
                    catch (Exception ex)
                    {
                        eof = true;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            Log("Progress Entered");
            progressBar1.Value = e.ProgressPercentage;
            Log(String.Format("Progress Changed to {0}", e.ProgressPercentage.ToString()));
        }

        void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            Log("Complete Entered");
            Application.DoEvents();
            Log("Events Done");
            MessageBox.Show("Complete!");
            Log("Message Shown");
        }

        private void setupProgressBar(object[] args)
        {
            try
            {
                if (this.InvokeRequired)
                {
                    DelegateMethod delegateMethod = new DelegateMethod(setupProgressBar);
                    this.Invoke(delegateMethod, new object[] { args });
                }
                else
                {
                    progressBar1.Maximum = (int)args[0];
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        void Log(string message)
        {
            writer.WriteLine(String.Format("{0}   -  {1}", DateTime.Now.ToString(), message));
            writer.Flush();
        }
    }
}