private void Logger_MessageWrited(object sender, MessageLogger e) { richTextBox.Do(s => { switch (e.Severity) { case MESSAGE_SEVERITY.NORMAL: s.AppendText(e.ComposeMsg() + "\r\n", Color.White); break; case MESSAGE_SEVERITY.GOOD: s.AppendText(e.ComposeMsg() + "\r\n", Color.LimeGreen); break; case MESSAGE_SEVERITY.WARN: s.AppendText(e.ComposeMsg() + "\r\n", Color.Yellow); break; case MESSAGE_SEVERITY.ERROR: s.AppendText(e.ComposeMsg() + "\r\n", Color.Red); break; } if (checkBoxAutoScroll.Checked) { s.SelectionStart = s.TextLength; s.ScrollToCaret(); } }); }