Code to access IMAP mail server and to read, delete and move emails between folders
private void Connect_Click_1(object sender, EventArgs e)
{
    string host = "mail.abc.com";
    string username = "autoresp@abc.com";
    string password = "xxxxxxxx";

    TcpIMAP imap = new TcpIMAP();
    imap.Connect(host, 143);
    imap.AuthenticateUser(username, password);

    Console.WriteLine("Total Messages " + imap.MailCount());
    Console.WriteLine("Total Unread Messages " + imap.MailUnreadCount());

    // You need to select the inbox in order to view the your messages

    imap.SelectInbox();


    object retmailID = imap.GetMessage(1);
    object retmail = imap.GetMessage(1);
    string inforet = retmail.ToString();

    Message.Clear();
    Message.Text += inforet;
    DiscectEmail(inforet);



    //  Select an IMAP mailbox
    string success;

    string sMessageUID;
    string destfolder = "";

    ImapResponseEnum eImapResponse = ImapResponseEnum.IMAP_SUCCESS_RESPONSE;
    string sCommandSuffix = "";


    imap.Disconnect();

    //Console.ReadKey();

}

public void SelectInbox()
{
    _imapSw.WriteLine("$ SELECT INBOX.Autoresp.Inbox");
    _imapSw.Flush();
    Response();
}