Npgsql.NpgsqlConnection.ReallyClose C# (CSharp) Method

        private void ReallyClose()
        {
            NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "ReallyClose");
            _postponingClose = false;

            // clear the way for another promotable transaction
            promotable = null;

            connector.Notification -= NotificationDelegate;
            connector.Notice -= NoticeDelegate;

            if (SyncNotification)
            {
                connector.RemoveNotificationThread();
            }

            if (Pooling)
            {
                NpgsqlConnectorPool.ConnectorPoolMgr.ReleaseConnector(this, connector);
            }
            else
            {
                Connector.ProvideClientCertificatesCallback -= ProvideClientCertificatesCallbackDelegate;
                Connector.CertificateSelectionCallback -= CertificateSelectionCallbackDelegate;
                Connector.CertificateValidationCallback -= CertificateValidationCallbackDelegate;
                Connector.PrivateKeySelectionCallback -= PrivateKeySelectionCallbackDelegate;
                Connector.ValidateRemoteCertificateCallback -= ValidateRemoteCertificateCallbackDelegate;

                if (Connector.Transaction != null)
                {
                    Connector.Transaction.Cancel();
                }

                Connector.Close();
            }

            connector = null;

            this.OnStateChange (new StateChangeEventArgs(ConnectionState.Open, ConnectionState.Closed));
        }