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C# FileSystemWatcher

Here is a code sample which explains the concept of FileSystemWatcher class

using System;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            FileSystemWatcher watcher = new 
FileSystemWatcher("c:\\LogFiles\\", "log.txt");
            watcher.Changed += new FileSystemEventHandler(watcher_Changed);
            watcher.EnableRaisingEvents = true;
            Console.ReadLine();
        }

        static void watcher_Changed(object sender, FileSystemEventArgs e)
        {
            if (e.ChangeType == WatcherChangeTypes.Changed)
            {
                using (TextWriter writer = new 
StreamWriter("C:\\ModifiedHistory.txt", true))
                {
                    writer.WriteLine(DateTime.Now.ToString());
                }
            }
        }
    }
}
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Categories: C#
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