Multiple socket reader in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

using ZeroMQ;

namespace Examples
{
static partial class Program
{
public static void MSReader(string[] args)
{
//
// Reading from multiple sockets
// This version uses a simple recv loop
//
// Author: metadings
//

using (var context = new ZContext())
using (var receiver = new ZSocket(context, ZSocketType.PULL))
using (var subscriber = new ZSocket(context, ZSocketType.SUB))
{
// Connect to task ventilator
receiver.Connect("tcp://127.0.0.1:5557");

// Connect to weather server
subscriber.Connect("tcp://127.0.0.1:5556");
subscriber.SetOption(ZSocketOption.SUBSCRIBE, "10001 ");

// Process messages from both sockets
// We prioritize traffic from the task ventilator
ZError error;
ZFrame frame;
while (true)
{
if (null != (frame = receiver.ReceiveFrame(ZSocketFlags.DontWait, out error)))
{
// Process task
}
else
{
if (error == ZError.ETERM)
return; // Interrupted
if (error != ZError.EAGAIN)
throw new ZException(error);
}

if (null != (frame = subscriber.ReceiveFrame(ZSocketFlags.DontWait, out error)))
{
// Process weather update
}
else
{
if (error == ZError.ETERM)
return; // Interrupted
if (error != ZError.EAGAIN)
throw new ZException(error);
}

// No activity, so sleep for 1 msec
Thread.Sleep(1);
}
}
}
}
}