Freelance server, Model Two 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 FLServer2(string[] args)
{
//
// Freelance server - Model 2
// Does some work, replies OK, with message sequencing
//
// Author: metadings
//

if (args == null || args.Length < 1)
{
Console.WriteLine();
Console.WriteLine("Usage: ./{0} FLServer2 [Endpoint]", AppDomain.CurrentDomain.FriendlyName);
Console.WriteLine();
Console.WriteLine(" Endpoint Where FLServer2 should bind on.");
Console.WriteLine(" Default is tcp://127.0.0.1:7781");
Console.WriteLine();
args = new string[] { "tcp://127.0.0.1:7781" };
}

string endpoint = args[0];

using (var context = new ZContext())
using (var server = new ZSocket(context, ZSocketType.REP))
{
server.Bind(endpoint);
Console.WriteLine("I: server is ready as {0}", endpoint);

ZError error;
ZMessage incoming;

while (true)
{
if (null == (incoming = server.ReceiveMessage(out error)))
{
if (error == ZError.ETERM)
break; // Interrupted
throw new ZException(error);
}

ZFrame identity;
using (incoming)
{
// Fail nastily if run against wrong client
if (incoming.Count < 2)
{
throw new InvalidOperationException();
}

identity = incoming.RemoveAt(0, false);
}
using (identity)
using (var outgoing = new ZMessage())
{
outgoing.Add(identity);
outgoing.Add(new ZFrame("OK"));

if (!server.Send(outgoing, out error))
{
if (error == ZError.ETERM)
break; // Interrupted
throw new ZException(error);
}
}
}

if (error == ZError.ETERM)
{
Console.WriteLine("W: interrupted");
}
}
}
}
}