FileSystemWatcher using Asp.Net (C#)

thanx .. ultimately i have to check the space for comparision but i m not using any button on my page like upload etc ...
after logged in, folder of a particular user is opened and he can  create/delete/edit any file by using mouse and keybords (as normally we do when we work on our PC and the space in our hard drives is reduced).
so i want a notifier which can help me detect that user has done something in his folder.

thanx.... but m using web app (asp.net) i cant use windows app.
wat to do ???

ok..but how to create that service ... i dont have any idea ... havnt worked anything like this b4....

You might need to create a service which will run on your server to monitor your files since this will run continuously. The page_load is not necessarily the best approach.

i have some folders on my FTP server, belongs to particular user. Suppose ihave 10GB total space and i assign 1GB to each user i.e i can accomodate 10 users having 1GB each.
now users can add/delete/edit any type of file to utilize the storage space. All i need to do is to restrict users not to exceed 1gb space for their file storage. For this i want to use FileSystemWatcher to notify me that a user had created/deleted/edited a file so that i can minimize the space from 1gb incase of creation of a file or add a space incase of deletion.
I have this code but i know its not correct b.c the event handlers are in console and i want pure web app.
Please help me in completing my this task. THANX
using System.IO;
using System.Threading;
using System.Diagnostics;
public partial class _Default : System.Web.UI.Page
{
    DAL conn;
    string connection;
    string id = string.Empty;
  
    protected void Page_Load(object sender, EventArgs e)
    {
        connection = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\project\\Desktop\\BE prj\\dbsan.mdb;Persist Security Info=False";
        conn = new DAL(connection);
              
        ////*** Opening Respective Folder of a User ***////
       
        DirectoryInfo directories = new DirectoryInfo(@"C:\\Inetpub\\ftproot\\san\\");
        //DirectoryInfo directories = new DirectoryInfo(@"C:\");
        DirectoryInfo[] folderList = directories.GetDirectories();
       
       
        if (Request.QueryString["id"] != null)
            id = Request.QueryString["id"];
        string path = Path.Combine(@"C:\\Inetpub\\ftproot\\san\\", id);
        int folder_count = folderList.Length;
        for (int j = 0; j < folder_count; j++)
            if (Convert.ToString(folderList[j]) == id)
            {
                Process p = new Process();
                p.StartInfo.FileName = path;
                p.Start();
            }
        ClsFileSystemWatcher FSysWatcher = new ClsFileSystemWatcher();
        FSysWatcher.FileWatcher(path);
    }
    public class ClsFileSystemWatcher
    {
        public void FileWatcher(string InputDir)
        {
            using (FileSystemWatcher fsw = new FileSystemWatcher())
            {
                fsw.Path = InputDir;
                fsw.Filter = @"*";
                fsw.IncludeSubdirectories = true;
                fsw.NotifyFilter =
                    NotifyFilters.FileName |
                    NotifyFilters.Attributes |
                    NotifyFilters.LastAccess |
                    NotifyFilters.LastWrite |
                    NotifyFilters.Security |
                    NotifyFilters.Size |
                    NotifyFilters.CreationTime |
                    NotifyFilters.DirectoryName;
                fsw.Changed += new FileSystemEventHandler(OnChanged);
                fsw.Created += new FileSystemEventHandler(OnCreated);
                fsw.Deleted += new FileSystemEventHandler(OnDeleted);
                fsw.Renamed += new RenamedEventHandler(OnRenamed);
                fsw.Error += new ErrorEventHandler(OnError);
                fsw.EnableRaisingEvents = true;
                //string strOldFile = InputDir + "OldFile.txt";
                //string strNewFile = InputDir + "CreatedFile.txt";
                //// Making changes in existing file
                //using (FileStream stream = File.Open(strOldFile, FileMode.Append))
                //{
                //    StreamWriter sw = new StreamWriter(stream);
                //    sw.Write("Appending new line in Old File");
                //    sw.Flush();
                //    sw.Close();
                //}
                //// Writing new file on FileSystem
                //using (FileStream stream = File.Create(strNewFile))
                //{
                //    StreamWriter sw = new StreamWriter(stream);
                //    sw.Write("Writing First line into the File");
                //    sw.Flush();
                //    sw.Close();
                //}
                //File.Delete(strOldFile);
                //File.Delete(strNewFile);
                // Minimum time given to event handler to track new events raised by the filesystem.
                Thread.Sleep(1000);
            }
        }
        public static void OnChanged(object source, FileSystemEventArgs e)
        {
            Console.WriteLine("File " + e.FullPath + " :" + e.ChangeType);
        }
        public static void OnDeleted(object source, FileSystemEventArgs e)
        {
            Console.WriteLine("File " + e.FullPath + " :" + e.ChangeType);
        }
        public static void OnCreated(object source, FileSystemEventArgs e)
        {
            Console.WriteLine("File " + e.FullPath + " :" + e.ChangeType);
        }
        public static void OnRenamed(object source, RenamedEventArgs e)
        {
            Console.WriteLine("File " + e.OldFullPath + " [Changed to] " + e.FullPath);
        }
        public static void OnError(object source, ErrorEventArgs e)
        {
            Console.WriteLine("Error " + e.ToString());
        }
    }
   
}

Thats fine if by coding server can track all d folder activities done at d client side .
my server is FTP. so could u help me in coding on server side ??? i need ur guidance in coding. thanx