Here is the Ontario Business Corporations Act.

http://www.canadalegal.com/gosite.asp?s=1773

Scroll down to section 185, "Rights of dissenting shareholders". It describes there how the dissents would be collected. In part:

"A dissenting shareholder shall send to the corporation, at or before any meeting of shareholders at which a resolution referred to in subsection (1) or (2) is to be voted on, a written objection to the resolution, unless the corporation did not give notice to the shareholder of the purpose of the meeting or of the shareholder’s right to dissent. R.S.O. 1990, c. B.16, s. 185 (6)."