(.NET Core C#) Upload to Tumbleweed SecureTransport FTPS Server

Demonstrates how to connect, authenticate, and upload file to a Tumbleweed Secure Transport SSL FTP Server. Instead of providing a login name and password, you pass the string "site-auth" for the username, and an empty string for the password. You must also provide a client-side digital certificate -- as the certificate's credentials and validity are used to authenticate.

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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();

// This code has been tested with the Tumbleweed server
// at sft.wellsfargo.com
ftp.Hostname = "sft.wellsfargo.com";

// Use these exact strings for the username and password:
ftp.Username = "site-auth";
ftp.Password = "";

// Establish an AUTH SSL secure channel after connecting.
// Your client-side certificate is used for authentication when
// the SSL channel is established.
ftp.AuthSsl = true;

// The Ssl property is for establishing an implicit SSL connection
// on port 990.  Do not set it.
ftp.Ssl = false;

// Load a certificate from a .pfx
// A PFX may contain several certs, including the certificates
// in a chain of authority.
Chilkat.CertStore certStore = new Chilkat.CertStore();
string password = "***";
// Load the certs from a PFX into an in-memory certificate store:
bool success = certStore.LoadPfxFile("my.pfx",password);
if (success != true) {
    Debug.WriteLine(certStore.LastErrorText);
    return;
}

// Find the exact cert we'll use:
Chilkat.Cert cert = certStore.FindCertBySubject("My Certificate 123 ABC");
if (certStore.LastMethodSuccess == false) {
    Debug.WriteLine("Certificate not found!");
    return;
}

// Tell the Chilkat FTP2 component to use the client-side
// cert for the SSL connection:
success = ftp.SetSslClientCert(cert);

// Connect and authenticate with the FTP server.
success = ftp.Connect();
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}
else {
    // LastErrorText contains information even when
    // successful. This allows you to visually verify
    // that the secure connection actually occurred.
    Debug.WriteLine(ftp.LastErrorText);
}

Debug.WriteLine("Secure FTP Channel Established!");

// Change to the remote directory where the file will be
// uploaded.  If your file is to be uploaded to the FTP user 
// account's home directory, this is not necessary.
success = ftp.ChangeRemoteDir("someSubDir");
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

// You may include an absolute or relative path with the 
// local filename.  If no path is included, the file should 
// be present in the current working directory of the calling
// process.
string localFilename = "someFile.dat";
string remoteFilename = "someFile.dat";

// Upload the file.
success = ftp.PutFile(localFilename,remoteFilename);
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

success = ftp.Disconnect();