SessionOptions.AddRawSettings("FtpUseMlsd", "1");

private void qtsTimer_Elapsed(object sender, ElapsedEventArgs e)
{
    string localPath = @"U:\CLM";
    string remotePath = "/";
 
    MyProgram_eventLog.WriteEntry("Checking the " + remotePath + " with the qtsTimer: " + DateTime.Now.ToString(), EventLogEntryType.Information);
 
    FtpQTS(localPath, remotePath);
}
 
private void FtpQTS(string localPath, string remotePath)
{
    ///<summary>The full path of the file on the FTP server.</summary>
    string remoteFile;
 
    try
    {
        // Setup session options
        SessionOptions sessionOptions = new SessionOptions
        {
            Protocol = Protocol.Ftp,
            HostName = "ftp.comany.com",
            UserName = "ftpuser",
            Password = "ftppass",
            // If using Protocol.Sftp then you would add the following line
            // SshHostKeyFingerprint = "ssh-rsa 2048 xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx"
        };
        MyProgram_eventLog.WriteEntry("A connection to ftpuser on ftpserver has been made", EventLogEntryType.Information);
 
        using (Session session = new Session())
        {
            //log session
            session.SessionLogPath = @"U:\CLM\Logs\WinSCPLog.log";
 
            // Connect
            session.Open(sessionOptions);
 
            RemoteDirectoryInfo remoteDirectory = session.ListDirectory(remotePath);
 
            MyProgram_eventLog.WriteEntry("Checking " + remotePath + " on ftpuser ftpserver for new files", EventLogEntryType.Information);
 
            foreach (RemoteFileInfo fileInfo in remoteDirectory.Files)
            {
                if (fileInfo.Name != "..")
                {
                    remoteFile = remotePath + fileInfo.Name;
                    MyProgram_eventLog.WriteEntry("A new file has been found: " + fileInfo.Name, EventLogEntryType.Information);
 
                    // Download the file and throw on any error
                    session.GetFiles(remotePath, localPath).Check();
                    MyProgram_eventLog.WriteEntry("Download to " + localPath + " done", EventLogEntryType.Information);
 
                    // Remove the file
                    session.RemoveFiles(remoteFile);
                    MyProgram_eventLog.WriteEntry("Removed file: " + remoteFile, EventLogEntryType.Information);
                }
                else
                {
                    MyProgram_eventLog.WriteEntry("Found " + fileInfo.Name + " which is not a new file", EventLogEntryType.Information);
                }
            }
        }
    }
    catch (Exception ex)
    {
        MyProgram_eventLog.WriteEntry("There was a problem in FtpQTS(): " + ex.ToString(), EventLogEntryType.Error);
        EmailError(ref ex);
    }
}