using System;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

    public static async Task Main()

    {

        //Your code goes here

        var semaphore = new SemaphoreSlim(0,1);

        var cts = new CancellationTokenSource();

        var entrance = semaphore.WaitAsync(cts.Token);

        cts.Cancel();

        cts.Dispose();

        Console.WriteLine("Entrance status: " + entrance.Status);

        try{await entrance; }catch{}Console.WriteLine("Entrance status: " + entrance.Status);

        semaphore.Release();

        Console.WriteLine("Current count: " + semaphore.CurrentCount);

    }

}