The BCL provides rich support for building multithreaded applications, including thread and thread pool management; thread-synchronization mechanisms such as monitors, mutexes, events, reader/writer locks, etc.; and access to such underlying platform features as I/O completion ports and system timers (see Section 3.8 in Chapter 3).

For more information, see the following namespaces:

System.Threading
System.Timers
System.Timers.Design

Important types in other namespaces include System.Thread-StaticAttribute .