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¡¡¡¡¡¡¡¡2. Monitor Class
¡¡¡¡¡¡¡¡3. ReaderWriterLock Class¡¡¡¡¡¡
           4. Mutex Class
           5. Semaphore
           6. Event
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private string lockFlag = "LOCK";
        public void GoWC(Person p)
        {
            lock (lockFlag)
            {
                Console.WriteLine("Begin");
                  Console.WriteLine("End");
            }
        }
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