Producer/Consumer example using asynchronous blocking queue. This example has 10 producers and 1 consumer. BufferBlock<T> is in the Microsoft.Tpl.Dataflow NuGet package

ProducerConsumerAsync.cs

private BufferBlock<int> queue = new BufferBlock<int>();

void Main()
{
	var producers = Enumerable.Range(0, 10).Select(async x =>
	{
		await Producer();
	});
	
	var consumer = Consumer();
	
	Task.WaitAll(producers.ToArray());
	consumer.Wait();
	
	Console.WriteLine("Done");
}

private async Task Producer()
{
	var data = Enumerable.Range(1, 5);
	
	foreach (var item in data)
	{
		await Task.Delay(TimeSpan.FromSeconds(1));
		await queue.SendAsync(item);
		Console.WriteLine("Producer. Item: {0}, TimeStamp: {1}", item, DateTime.Now);
	}
	
	queue.Complete();
	
	return;
}

private async Task Consumer()
{
	while (await queue.OutputAvailableAsync())
	{
		var item = await queue.ReceiveAsync();
		Console.WriteLine("Consumer. Item: {0}, TimeStamp: {1}", item, DateTime.Now);	
	}
	
	return;
}