FolderWatcher.cs

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 FolderWatcher {
    public partial class FolderWatcher : Form {

        private FileSystemWatcher watcher = new FileSystemWatcher();
        private string logMessage = "";
        
        public FolderWatcher() {
            InitializeComponent();
        }

        private void FolderWatcher_Load(object sender, EventArgs e) {
            this.boxFolder.Text = @"D:\test";
            this.startMonitoring();
        }

        private void startMonitoring() {
            this.watcher.Path = boxFolder.Text;

            this.watcher.Filter = "";
            this.watcher.IncludeSubdirectories = true;
            this.watcher.Renamed += new RenamedEventHandler(renamed);
            this.watcher.Deleted += new FileSystemEventHandler(changed);
            this.watcher.Changed += new FileSystemEventHandler(changed);
            this.watcher.Created += new FileSystemEventHandler(changed);

            this.watcher.EnableRaisingEvents = true;
        }

        private void renamed(object sender, RenamedEventArgs e) {
            this.logMessage = new StringBuilder(DateTime.Now + ": " + e.ChangeType + " " + e.FullPath + "\n").ToString();

            if (this.InvokeRequired) {
                this.Invoke(new MethodInvoker(writeLog));
            } else {
                writeLog();
            }
        }

        private void changed(object sender, FileSystemEventArgs e) {
            this.logMessage = new StringBuilder(DateTime.Now + ": " + e.ChangeType + " " + e.FullPath + "\n").ToString();

            if (this.InvokeRequired) {
                this.Invoke(new MethodInvoker(writeLog));
            } else {
                writeLog();
            }
        }

        private void FolderWatcher_Resize(object sender, EventArgs e) {
            if (FormWindowState.Minimized == WindowState) {
                this.Hide();
                this.minIcon.Visible = true;
            }
        }

        private void minIcon_MouseDoubleClick(object sender, MouseEventArgs e) {
            this.Show();
            this.WindowState = FormWindowState.Normal;
            this.minIcon.Visible = false;
        }

        private void btnBrowse_Click(object sender, EventArgs e) {
            this.folderBrowserDialog.ShowDialog();
            this.boxFolder.Text = folderBrowserDialog.SelectedPath;
            this.setPath(boxFolder.Text);
        }

        private void setPath(string path) {

            if (Directory.Exists(path)) {
                this.watcher.EnableRaisingEvents = false;
                this.watcher.Path = path;
                this.watcher.EnableRaisingEvents = true;
                this.boxInfo.AppendText("Changed Directory: " + path + "\n");
            } else {
                this.boxInfo.AppendText("ERROR: " + path + " does not exist.\n");
            }
        }

        private void writeLog() {
            this.boxInfo.AppendText(this.logMessage);
        }

        private void boxFolder_Leave(object sender, EventArgs e) {
            this.setPath(boxFolder.Text);
        }
    }
}