A director may waive any notice before or after the date and time stated in the notice. Except as provided herein, the waiver must be in writing, signed by the director entitled to the notice, and delivered to the corporation for inclusion in the minutes or filing with the corporate records. A director's attendance at or participation in a meeting waives any required notice to him or her of the meeting unless the director at the beginning of the meeting (or promptly upon his or her arrival) objects to holding the meeting or transacting business at the meeting and does not thereafter vote for or assent to action taken at the meeting.