System.Threading 4.0.0 System.Threading true Microsoft Microsoft http://go.microsoft.com/fwlink/?LinkId=329770 http://go.microsoft.com/fwlink/?LinkID=288859 Provides the fundamental synchronization primitives, including System.Threading.Monitor and System.Threading.Mutex, that are required when writing asynchronous code. Commonly Used Types: System.Threading.Monitor System.Threading.SynchronizationContext System.Threading.ManualResetEvent System.Threading.AutoResetEvent System.Threading.ThreadLocal<T> System.Threading.EventWaitHandle System.Threading.SemaphoreSlim System.Threading.Mutex Provides the fundamental synchronization primitives, including System.Threading.Monitor and System.Threading.Mutex, that are required when writing asynchronous code. Copyright © Microsoft Corporation