C# - how to check file has finished being written to from a ftp?

We have a server which receives files by SFTP into a given directory
I have a C# program which periodically checks the directory for files then sends them to another server.
The program sends anything it finds to the second server then deletes it from the first server.
How can I make sure that I don't try to send a file that has not been fully FTPd to the first server?
I'm using a windows form with C# in visual studio 2008.
AlHal2Asked:
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CodeCruiserCommented:
There are usually two approaches

1) Use a marker file to indicate that all other files have been uploaded.
2) When you see a file on SFTP for the first time, capture its modified date and size and then check it again after a set amount of time (5 minutes?). If the size has changed, the file may still be being uploaded. If not, its completely uploaded.
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AlHal2Author Commented:
Thanks codeCruiser.  I'm using the System.IO reference in my project.  It doesn't have the modified date and size.  It only has the properties here.
http://msdn.microsoft.com/en-us/library/system.io.filesysteminfo_properties(v=vs.90).aspx
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CodeCruiserCommented:
You need to create a FileInfo object and then use the LastWriteTime

http://msdn.microsoft.com/en-us/library/system.io.fileinfo(v=vs.110).aspx
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AlHal2Author Commented:
Thanks.
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