Async TcpListener/TcpClient example

AsyncTcp.cs

using System;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading.Tasks;

public class Program
{
    public static void Main(string[] args)
    {
        MainAsync().GetAwaiter().GetResult();
    }

    static async Task MainAsync()
    {
        Console.WriteLine("Starting...");
        var server = new TcpListener(IPAddress.Parse("0.0.0.0"), 66);
        server.Start();
        Console.WriteLine("Started.");
        while (true)
        {
            var client = await server.AcceptTcpClientAsync().ConfigureAwait(false);
            var cw = new ClientWorking(client, true);
            Task.Run((Func<Task>)cw.DoSomethingWithClientAsync);
        }
    }
}

class ClientWorking
{
    TcpClient _client;
    bool _ownsClient;

    public ClientWorking(TcpClient client, bool ownsClient)
    {
        _client = client;
        _ownsClient = ownsClient;
    }

    public async Task DoSomethingWithClientAsync()
    {
        try
        {
            using (var stream = _client.GetStream())
            {
                using (var sr = new StreamReader(stream))
                using (var sw = new StreamWriter(stream))
                {
                    await sw.WriteLineAsync("Hi. This is x2 TCP/IP easy-to-use server").ConfigureAwait(false);
                    await sw.FlushAsync().ConfigureAwait(false);
                    var data = default(string);
                    while (!((data = await sr.ReadLineAsync().ConfigureAwait(false)).Equals("exit", StringComparison.OrdinalIgnoreCase)))
                    {
                        await sw.WriteLineAsync(data).ConfigureAwait(false);
                        await sw.FlushAsync().ConfigureAwait(false);
                    }
                }

            }
        }
        finally
        {
            if (_ownsClient && _client != null)
            {
                (_client as IDisposable).Dispose();
                _client = null;
            }
        }
    }
}