Problem in FileSystem Wather usign C#.net

Hi friends,
In my Project, I am using Backgroundworker ,FileSystemwather ,some button and Some TextBox. Some times, Filesystem Watcher is not triggered.Please help me.Please see my Code.

Declaration Part:

  FileSystemWatcher fswatcher = new FileSystemWatcher();

Coding Part:
From Button , To button adn From TextBox ,To TextBox using FolderBrowserDialog.

private void btn_From_Click(object sender, EventArgs e)
        {
            Fbrowsedialog = new FolderBrowserDialog();
            Fbrowsedialog.ShowDialog();
            txtfrom.Text = Fbrowsedialog.SelectedPath;

            
        }

        private void btn_To_Click(object sender, EventArgs e)
        {
            Fbrowsedialog = new FolderBrowserDialog();
            Fbrowsedialog.ShowDialog();
            txtTo.Text = Fbrowsedialog.SelectedPath;
        }

Copy Files:
btn_Copy Event

  private void btn_copy_Click(object sender, EventArgs e)
        {
            btn_From.Enabled = false;
            btn_To.Enabled = false;
            btn_copy.Enabled = false;
            bworker.RunWorkerAsync();
        }

Using Background Component

private void bworker_DoWork(object sender, DoWorkEventArgs e)
{
try
{
DirectoryInfo dir = new DirectoryInfo(txtfrom.Text);
string[] files = Directory.GetFiles(txtfrom.Text);
if (files.Length > 0)
{
chkDir(txtfrom.Text, txtTo.Text, "pcl");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

}

private void bworker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{

}

private void bworker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
try
{
btn_From.Enabled = true;
btn_To.Enabled = true;
btn_copy.Enabled = true;

}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

Function for Copying One folder and Another Folder with Partcular file Type:

 private static void chkDir(string fileDir, string sPath, string fext)
        {
            string[] fsDir = Directory.GetFiles(fileDir);
            foreach (string f in fsDir)
            {
                string fName = f.Substring(fileDir.Length + 1);
                string[] fileExt = fName.Split('.');
                if (fileExt[1] == fext)
                {
                    File.Copy(Path.Combine(fileDir, fName), Path.Combine(sPath, fName), true);
                }
            }

        }

Created Event for FileSystem Watcher

  private void watcher_Created(object source, FileSystemEventArgs e)
        {
            MessageBox.Show("Files created");
        }

Monitoring btn

      private void btn_fmonitor_Click(object sender, EventArgs e)
        {
            fswatcher.Path = txtTo.Text;
            fswatcher.Filter = "*.pcl";
            fswatcher.Created += new FileSystemEventHandler(watcher_Created);
            fswatcher.EnableRaisingEvents = true;
            fswatcher.Created += new FileSystemEventHandler(watcher_Created);
        
        }

Close button

 private void btn_close_Click(object sender, EventArgs e)
        {
            fswatcher.EnableRaisingEvents = false;
            Application.Exit();
        }

File Created .But message Box will not display. why? Please tell me.

Regards,
Lakshmi Naraayanan.S
http://dotnettechrocks.blogspot.in/
http://abaprocker.blogspot.com/