using System;

using System.Diagnostics;

using System.Collections.Concurrent;

using System.Linq;

​

public class Program

{

    internal class Bob

    {

        public int SequenceNumber

        {

            get;

            set;

        }

​

        public int Device

        {

            get;

            set;

        }

    }

​

    public static void Main()

    {

        var items = new ConcurrentQueue<Bob>();

        var r = new Random();

        for (int i = 0; i < 1000000; i++)

        {

            items.Enqueue(new Bob()

            {SequenceNumber = i, Device = r.Next(1000)});

        }

​

        var sw = Stopwatch.StartNew();

        foreach (var inSequence in items.Where(w => w.Device == 1))

        {

            Console.WriteLine(inSequence.SequenceNumber);

        }

​

        Console.WriteLine(sw.Elapsed);

    }

}