private static FileSystemWatcher Watcher;
private static bool IsStarting;

internal static void Start()
{
    if (IsStarting) return;
    Watcher = new FileSystemWatcher(Boot.Folder)
    {
        EnableRaisingEvents = true,
        IncludeSubdirectories = true
    };
    Watcher.Created += WatcherOnCreated;
    IsStarting = true;
}

private static void WatcherOnCreated(object sender, FileSystemEventArgs e)
{
     Logger.Write(e.FullPath);
}