Before any party to an obligation can require another party to perform any act under it, he must fulfill all conditions precedent thereto imposed upon himself; and must be able, and offer, to fulfill all conditions concurrent, so imposed upon him, on the like fulfillment by the other party, except as provided by § 20-2-6 . Source: CivC 1877, § 809; CL 1887, § 3432; RCivC 1903, § 1125; RC 1919, § 732; SDC 1939, § 47.0109.