(.NET Core C#) Upload (Append) Email to an IMAP Mailbox and get the UID of the Appended Email

Upload / append an email to an IMAP mailbox and get the UID of the appended email.

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

Chilkat.Imap imap = new Chilkat.Imap();

// Connect to an IMAP server.
// Use TLS
imap.Ssl = true;
imap.Port = 993;
bool success = imap.Connect("imap.someMailServer.com");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Login
success = imap.Login("myLogin","myPassword");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Check the capabilities of the IMAP server.
string cap = imap.Capability();
Debug.WriteLine("IMAP capabilities: " + cap);

// If the capabilities string contains the substring "UIDPLUS", then 
// the UID of the appended email will be available in the AppendUid property (see below).

// For example, the GMail IMAP server has these capabilities (at this current time)
// * CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN 
// X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE ENABLE MOVE CONDSTORE ESEARCH UTF8=ACCEPT 
// APPENDLIMIT=35882577 LIST-EXTENDED LIST-STATUS

Chilkat.Email email = new Chilkat.Email();

// Load the email from a .eml file.
success = email.LoadEml("myEmail.eml");
if (success != true) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

success = imap.AppendMail("Inbox",email);
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// If the IMAP server supports the UIDPLUS extension, then the 
// imap.AppendUid will contain the UID of the appended email.
// Otherwise AppendUid will be 0.
Debug.WriteLine("UID of appended email: " + Convert.ToString(imap.AppendUid));

// If the IMAP server does NOT have UIDPLUS, then a program can 
// first select the mailbox, get the value of the UidNext property,
// and then append.  The appended email SHOULD have a UID equal to 
// the UidNext that was obtained just prior to appending (assuming no other
// program is simultaneously appending an email to the same mailbox).

// Note: It is not required to select a mailbox to append.  The select is only
// done for the purpose of obtaining the UIDNEXT value.
success = imap.SelectMailbox("Inbox");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

int uidNext = imap.UidNext;

success = imap.AppendMail("Inbox",email);
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

Debug.WriteLine("The UID of the appended email SHOULD be " + Convert.ToString(uidNext));

Debug.WriteLine("Email uploaded to Inbox!");

// Disconnect from the IMAP server.
success = imap.Disconnect();