using System;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

  static ReaderWriterLockSlim _readerWriterLockSlim = new ReaderWriterLockSlim(LockRecursionPolicy.NoRecursion);

​

  static async Task Test()

  {

    var lockTaken = false;

    try

    {

      Console.WriteLine("Try");

      lockTaken = _readerWriterLockSlim.TryEnterReadLock(-1);

      await Task.Delay(2000);

      Console.WriteLine("Hello");

    }

    finally 

    {

      Console.WriteLine("Finally");

      if (lockTaken)

      {

        _readerWriterLockSlim.ExitReadLock();

      }

    }

  }

​

  public static void Main(string[] args)

  {

    var t = Task.WhenAll(Test(), Test());

    t.Wait();

    Console.ReadKey();

  }

}