C# filesystemwatcher not triggering for all files in watch folder

Question

I am using C# filesystemwatcher to monitor a folder for new files that are generated from two web sites running on the same machine. Sometimes new files trigger my event handler and sometimes they do not.

FileSystemWatcher watcher = new FileSystemWatcher
{
 Path = "c:/inetpub/websites/site1/PDF/Source",
 NotifyFilter = NotifyFilters.LastWrite,
 Filter = "*.*"
};
watcher.Changed += new FileSystemEventHandler(OnNewFileCreated);
watcher.EnableRaisingEvents = true; 

When I examine the properties of the new files, the only real difference is the Details->Owner which are set to the web site names.

The files from site1 are processed, but the files with site2 are not. I can copy and paste the site2 file in explorer and then it is acted on.

I can try moving the folder to a c:/temp folder but this did not make much sense to do so.

Are there any ideas on what is going on? Any tips will be appreciated.

Thanks - Steve

• Jimi: Have tried adding NotifyFilters.FileName to the filter? Do both acutally save files in the same exact folder, or some subfolder? If that's the case, add .IncludeSubdirectories = true
• Fildor: That's a quite unusual way for writing a path in Windows. But anyway: Does site2 do anything differently when writing those files? Are they closed properly?
• Oleh Ivanitskyy: @pop, please, subscribe watcher to Error event and log error, maybe it will help to understand the issue. And if I do not mistake, after any error in fsw he must be recreated, because it will stop firing events
• Pop: @Jimi - yes, both sites write to the same folder, the base folder I am watching
• Pop: @OlehIvanitskyy - I added the following lines (without any luck) watcher.Created += new FileSystemEventHandler(OnNewFileCreated); watcher.Error += new ErrorEventHandler(OnError)