Monitoring files

Question

Hi, I have to monitor a folder for new files. I use System.IO.FileSystemWatcher to do that. The problem is that the files are downloading over there and I have to find out when they are completely downloaded. The System.IO.FileSystemWatcher fires an event when the file is first created and 2 others, of the same type after that. But I can't get the moment when the files are completely downloaded. If you have any idea... Mircea.