Neb. Rev. Stat. § 21-2,175

(MBCA 13.21) (a) If a corporate action specified in subsection (a) of section 21-2,172 is submitted to a vote at a shareholders' meeting, a shareholder who wishes to assert appraisal rights with respect to any class or series of shares: (1) Must deliver to the corporation, before the vote is taken, written notice of the shareholder's intent to demand payment if the proposed action is effectuated; and (2) Must not vote, or cause or permit to be voted, any shares of such class or series in favor of the proposed action. (b) If a corporate action specified in subsection (a) of section 21-2,172 is to be approved by less than unanimous written consent, a shareholder who wishes to assert appraisal rights with respect to any class or series of shares must not sign a consent in favor of the proposed action with respect to that class or series of shares. (c) A shareholder who fails to satisfy the requirements of subsection (a) or (b) of this section is not entitled to payment under sections 21-2,171 to 21-2,183 .