High Performance Multi-threaded Work Item / Event Scheduling Engine

using System;
using System.Threading;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using BrainTechLLC;
using BrainTechLLC.EmlenMud;
using BrainTechLLC.EmlenMud.Objects;
using BrainTechLLC.EmlenMud.Interfaces;
using BrainTechLLC.ThreadSafeObjects;

namespace Article1
{
    public class DemoWorkItem : IExecutableWorkItem 
    {
        private static long _workItemsExecuted;

        public DemoWorkItem(DateTime executionTime) { ExecutionTime = executionTime; }
        public DateTime ExecutionTime { get; set; }
        public bool Cancelled { get; set; }
        public void Execute()
        {
            long n = Interlocked.Increment(ref _workItemsExecuted);
            long nMod5 = n % 5;
            switch (nMod5)
            {
                case 0:
                    WorkItemResult = (n + 1000) / 3;
                    break;
                case 1:
                    WorkItemResult = new TestThing(Convert.ToInt32(n / 500000), nMod5.ToString());
                    break;
                case 2:
                    WorkItemResult = 12;
                    break;
                case 3:
                    WorkItemResult = "This is a test";
                    break;
                case 4:
                    WorkItemResult = "ABC";
                    break;
            }
        }
        public object WorkItemResult { get; set; }
    }

    public class TestThing
    {
        public TestThing(int testValue, string testStringValue)
        {
            TestValue = testValue;
            TestStringValue = testStringValue;
        }
        public int TestValue {get;set;}
        public string TestStringValue {get;set;}
    }
}