(.NET Core C#) Fetch Oldest/Newest IMAP Email

Emails may be downloaded by sequence number. Assuming the selected mailbox is not empty, the oldest email is at sequence number 1, and the newest email is at sequence number N. The FetchSingle method may be used to download by sequence number.

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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("mail.testemail.net");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

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

// Select an IMAP mailbox
success = imap.SelectMailbox("Inbox");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// After selecting a mailbox, the NumMessages property
// contains the number of emails in the selected mailbox.
int n;
n = imap.NumMessages;

if (n > 0) {

    // The oldest email is always at sequence number 1.
    bool isUid = false;

    Chilkat.Email oldestEmail = null;
    oldestEmail = imap.FetchSingle(1,isUid);
    if (imap.LastMethodSuccess == true) {

        // Display the From and Subject
        Debug.WriteLine(oldestEmail.FromAddress);
        Debug.WriteLine(oldestEmail.Subject);

        Debug.WriteLine("--");

    }

    // The newest email is at sequence number N:
    Chilkat.Email newestEmail = null;
    newestEmail = imap.FetchSingle(n,isUid);
    if (imap.LastMethodSuccess == true) {

        // Display the From and Subject
        Debug.WriteLine(newestEmail.FromAddress);
        Debug.WriteLine(newestEmail.Subject);

    }

}

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