S.C. Code Ann. § 33-13-210: Notice of intent to demand payment.

(a) If proposed corporate action creating dissenters' rights under Section 33-13-102 is submitted to a vote at a shareholders' meeting, a shareholder who wishes to assert dissenters' rights (1) must give to the corporation before the vote is taken written notice of his intent to demand payment for his shares if the proposed action is effectuated and (2) must not vote his shares in favor of the proposed action. A vote in favor of the proposed action cast by the holder of a proxy solicited by the corporation shall not disqualify a shareholder from demanding payment for his shares under this chapter.

(b) A shareholder who does not satisfy the requirements of subsection (a) is not entitled to payment for his shares under this chapter.