Monitoring files - how to know when a file is complete

Question

We have several .NET applications that monitor a directory for new files, using FileSystemWatcher. The files are copied from another location, uploaded via FTP, etc. When th

Answer 1

+1 for using a file.ext.end signaler if possible, where the contents of file.ext.end is a checksum for the larger file. This isn't for security so much as it is to make sure nothing got garbled along the way. If someone can insert their own file into the large stream they can replace the checksum as well.