TaskFactory problem

Hello.

I have code.

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using YP.ToolKit.Protocols.ModBus.Transport;

namespace SmokeTest
{
    class Program
    {
        static void Main(string[] args)
        {
            //var task = new Task<IEnumerable<int>>(AsyncSmokeTest.SendReceiveRequests(new InformationClass("127.0.0.1", 1300, new byte[] { 12, 12, 12, 12, 12, 12, 12, 12 })));
            //var task = new Task<IEnumerable<int>>(n => AsyncSmokeTest.SendReceiveRequests((InformationClass)n), new InformationClass("127.0.0.1", 1300, new byte[]{12,12,12,12,12}));
            var data = new byte[] { 0, 2, 0, 0, 0, 6, 0, 4, 0, 2, 0, 0x1C };
            var watch = new Stopwatch();
            watch.Start();
                TaskFactory parent = new TaskFactory();

                var tasks = new[]
                {
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.208", 4444, data))),
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.209", 4444, data))),
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.210", 4444, data))),
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.211", 4444, data))),
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.212", 4444, data))),
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.213", 4444, data))),
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.214", 4444, data))),
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.215", 4444, data))),
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.216", 4444, data))),
                    parent.StartNew(
                        () => SendReceiveRequests(new InformationClass("010.024.135.217", 4444, data)))
                };
            Task.WaitAll(tasks);
            Console.ReadLine();
            //mainTask.Start();
            //mainTask.Wait();
            //Task.WaitAll(tasks);
            watch.Stop();
            Console.WriteLine("{0}", watch.Elapsed);
        }

        public static IEnumerable<int> SendReceiveRequests(InformationClass information)
        {
            TcpClientTransport client = new TcpClientTransport(information._ipAddress, information._port);

            IAsyncResult asyncResult = client.BeginWrite(information._bufSend, 0, information._bufSend.Length, information.Enumerator.End(), null);
            yield return 1;

            client.EndWrite(information.Enumerator.DequeueAsyncResult());

            Console.WriteLine("Writing ended.");
            //Console.ReadLine();

            IAsyncResult asyncResultOfRead = client.BeginRead(information._bufReceive, 0, information._bufReceive.Length, information.Enumerator.End(), null);
            yield return 1;

            int size = client.EndRead(information.Enumerator.DequeueAsyncResult());
            byte[] data = new byte[size];
            for (int i = 0; i < size; i++)
            {
                Console.Write("{0}  ", information._bufReceive[i]);
            }
            Console.WriteLine();
            //for (int i = 0; i < size; i++)
            //{
            //    Console.Write("{0}  ", data[i]);
            //}
        }
    }
}

But my static method SendReceiveRequests doesn't called and program goes to Console.ReadLine().
Please, help me and tell why.

Sorry for my English.