Method in Global.asax file fires twice?

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C#

ASP.NET

Hi, I have been working on an old project which uses the Global.asax file to watch a specified directory.

The problem is that, whenever a new file arrives to watched directory the method fsw_Changed(object sender, FileSystemEventArgs e) fires twice.

The code is as follows:

Thank you very much,

public class Global : System.Web.HttpApplication
{
    private FileSystemWatcher fsw;

    protected void Application_Start(object sender, EventArgs e)
    {
        string monitorPath = this.Context.Server.MapPath("~/dir1/dir2/" + DateTime.Now.Year.ToString());
        Application.Add("watcher", new FileSystemWatcher(monitorPath));
        fsw = (FileSystemWatcher)Application["watcher"];
        fsw.EnableRaisingEvents = true;
        fsw.IncludeSubdirectories = false;

        fsw.Changed += new FileSystemEventHandler(fsw_Changed);
    }

    private void fsw_Changed(object sender, FileSystemEventArgs e)
    {
        //.......
        //.......
    }
}