Convert vs TryParse test

using System;
using System.Diagnostics;
using System.Collections.Generic;

namespace Test
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            Random r = new Random();

            List<string> list = new List<string>();
            for (int i = 0; i < 1000000; ++i)
            {
                string listItem = "";
                for (int j = 0; j < 4; ++j)
                {
                    listItem += r.Next(10).ToString();
                }

                int index;
                if ((index = r.Next(2)) == 0)
                {
                    listItem = listItem.Replace(listItem [index], (char)(r.Next(short.MaxValue - 20) + 20));
                }

                list.Add(listItem);
            }

            Stopwatch sw = new Stopwatch();

            sw.Start();
            {
                int dummy = 0;
                for (int i = 0; i < list.Count; ++i)
                {
                    string str = list [i];
                    try
                    {
                        Convert.ToInt32(str);
                        ++dummy;
                    } catch
                    {
                        --dummy;
                    }
                }
            }
            sw.Stop();

            long method1 = sw.ElapsedMilliseconds;

            sw.Reset();
            sw.Start();
            {
                int dummy = 0;
                for (int i = 0; i < list.Count; ++i)
                {
                    string str = list [i];
                    int output;
                    if (int.TryParse(str, out output))
                    {
                        ++dummy;
                    }
                    else
                    {
                        --dummy;
                    }
                }
            }
            sw.Stop();

            long method2 = sw.ElapsedMilliseconds;

            Console.WriteLine("METHOD 1: {0}", method1);
            Console.WriteLine("METHOD 2: {0}", method2);
        }
    }
}