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ReaderWriterLock DowngradeFromWriterLock

using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Reflection; using System.Runtime; using System.Runtime.CompilerServices; using System.Security; using System.Text; using System.Threading; public class MainClass {          public static void Main()     {        ReaderWriterLock rwLock = new ReaderWriterLock();         rwLock.AcquireReaderLock(250);         if (!rwLock.IsReaderLockHeld)            return;         Console.WriteLine("Reader lock held");                  LockCookie cookie = rwLock.UpgradeToWriterLock(250);         if (rwLock.IsWriterLockHeld)         {             Console.WriteLine("Upgraded to writer lock");             rwLock.DowngradeFromWriterLock(ref cookie);         }         rwLock.ReleaseReaderLock();     } }