N.C. Gen. Stat. § 59-603

A limited partner may withdraw from a limited partnership only at the time or upon the happening of events specified in writing in and in accordance with the partnership agreement, including any amendment or addendum to the partnership agreement agreed upon by the partners unanimously or in accordance with the terms of the agreement and made in connection with any permitted withdrawal. If the partnership agreement does not specify in writing the time or the events upon the happening of which a limited partner may withdraw, a limited partner may not withdraw prior to the time for the dissolution and winding up of the limited partnership.