Basic app to test and compare the generated IL

Program.cs

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            DoIt1();
            DoIt2();
        }

        private static void DoIt1()
        {
            for (int i = 0; i < 100; i++)
            {
                var x = i * 2;

                Console.WriteLine(x);
            }
        }
        private static void DoIt2()
        {
            int x;

            for (int i = 0; i < 100; i++)
            {
                x = i * 2;

                Console.WriteLine(x);
            }
        }
    }
}