Synchronizes memory access as follows: The processor executing the current thread cannot reorder instructions in such a way that memory accesses prior to the call to Thread.MemoryBarrier execute after memory accesses that follow the call to Thread.MemoryBarrier.
Thread.MemoryBarrier is required only on multiprocessor systems with weak memory ordering (for example, a system employing multiple Intel Itanium processors).
For most purposes, the C# lock statement, the Visual Basic SyncLock statement, or the System.Threading.Monitor class provide easier ways to synchronize data.