Only .exe and .dll files have version info, which can be read by using
FileVersionInfo..::.GetVersionInfo(). Text files do not have version info.
Also, in order to read this version info, you'll have to download the file
to a temp location.
Alternately, you can use the LastModifiedDate of the file to check if it is more
recent. That will work for any type of file and can be done directly at the FTP
site w/o downloading the file:
string requestUriString = BuildRequestUriString(ServerName, Path, fileName);
FtpWebRequest aRequest = (FtpWebRequest) WebRequest.Create(requestUriString)
aRequest.Method = WebRequestMethods.Ftp.GetDateTimestamp;
...
using (FtpWebResponse aResponse = (FtpWebResponse) aRequest.GetResponse())
{
return aResponse.LastModified;
}