C# Exception performance hit example

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ExceptionsAreBad
{
    class Program
    {
        static void Main(string[] args)
        {
            var t1 = new Task(() =>
            {
                DateTime started = DateTime.Now;
                var thing = new LongRunningThing();
                int count = 0;
                for (;;)
                {
                    try
                    {
                        thing.DoStuff();
                    }
                    catch { }
                    var now = DateTime.Now;
                    if (now - started > new TimeSpan(0, 1, 0))
                    {
                        Console.WriteLine("normal count: " + count.ToString());
                        Console.WriteLine(String.Format("normal avg time: {0}ms", (now - started).TotalMilliseconds / count));
                        break;
                    }
                    else
                        count++;
                }
            });
            var t2 = new Task(() =>
            {
                DateTime started = DateTime.Now;
                var thing = new LongRunningThingWithException();
                int count = 0;
                for (;;)
                {
                    try
                    {
                        thing.DoStuff();
                    }
                    catch { }
                    var now = DateTime.Now;
                    if (now - started > new TimeSpan(0, 1, 0))
                    {
                        Console.WriteLine("exception count: " + count.ToString());
                        Console.WriteLine(String.Format("exception avg time: {0}ms", (now - started).TotalMilliseconds / count));
                        break;
                    }
                    else
                        count++;
                }
            });

            t1.Start(); t2.Start();
            Task.WaitAll(t1, t2);
            Console.WriteLine("done.");
            Console.ReadKey();
        }
    }

    public class LongRunningThing
    {
        public virtual void DoStuff()
        {
            System.Threading.Thread.Sleep(100);
        }
    }

    public class LongRunningThingWithException : LongRunningThing
    {
        public override void DoStuff()
        {
            base.DoStuff();
            throw new Exception("this is an exception. hooray!");
        }
    }
}