SignalR Client Hub Call

using System;
using System.Threading.Tasks;
using Microsoft.AspNet.SignalR.Client.Hubs;

namespace AsyncMessageSender
{
    internal class Program
    {
        private const string PrivateKey = "bcf9f7ff-dd90-41ac-b737-dd0b93be3fc5";
        private const string Url = "http://localhost:6398";

        private static void Main(string[] args)
        {
            var connection = new HubConnection(Url, "key=" + PrivateKey);
            var hub = connection.CreateHubProxy("chatHub");

            connection.Start().Wait();

            hub.Invoke("SendRequest", "[usuário]", "[mensagem]")
               .ContinueWith(task =>
                                 {
                                     if (task.IsFaulted)
                                     {
                                         if (task.Exception != null)
                                             Console.WriteLine(task.Exception.GetBaseException().Message);
                                     }
                                     else
                                     {
                                         Console.WriteLine("End.");
                                     }
                                 })
               .ContinueWith(task =>
                                 {
                                     Console.ReadLine();
                                 }, TaskContinuationOptions.OnlyOnFaulted);

            Console.ReadLine();
        }
    }
}