private void OnChanged(object source, FileSystemEventArgs e)
{
if (e.ChangeType == WatcherChangeTypes.Changed)
{
host.UpdateMetadata(new DiscoveryMetadata(SubsystemCommInfo.BroadcastMetaDataAssemblyTag,
File.GetLastWriteTime(e.FullPath).ToString("yyyy-MM-dd_h-m-s-fff")));
}
}