Software Transactional Memory (STM.NET) is a mechanism for efficient isolation of shared state.  The programmer demarcates a region of code as operating within a transaction that is “atomic” and “isolated” from other transacted code running concurrently.

Transactional memory is considered a promising technology by the academic community and is repeatedly brought up as a welcome technology for the upcoming wave of applications which scale on modern multi-core hardware. The goal is to be able to exploit concurrency by using components written by experts and consumed by application programmers who can then compose together these components using STM. Transactional memory provides an easy-to-use mechanism to do this safely.

check it out here