(.NET Core C#) Synchronize Remote Directory Tree

Uploads a directory tree from the local filesystem to the FTP server. Synchronization modes include:

mode=0: Upload all files
mode=1: Upload all files that do not exist on the FTP server.
mode=2: Upload newer or non-existant files.
mode=3: Upload only newer files. If a file does not already exist on the FTP server, it is not uploaded.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Ftp2 ftp = new Chilkat.Ftp2();

ftp.Hostname = "ftp.example.com";
ftp.Username = "login";
ftp.Password = "password";

ftp.KeepSessionLog = true;

// Connect and login to the FTP server.
bool success = ftp.Connect();
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

// Set the current remote directory to the root of
// the tree where files are uploaded.
success = ftp.ChangeRemoteDir("/abc123");
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

// Recursively upload all non-existant and newer files.
int mode = 2;
success = ftp.SyncRemoteTree("c:/temp/abc123",mode);
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

success = ftp.Disconnect();

// Display the session log.  
Debug.WriteLine(ftp.SessionLog);