Compiling but no out put

This program is given in the following website. It is compiling but not producing any output. Please correct it.

http://www.dotnetperls.com/static-field

using System;
using System.Diagnostics;

class Test1
{
int _a; // Instance fields:
int _b;
int _c;
public void X()
{
this._a++; // Change instance field values:
this._b++;
this._c++;
}
}

class Test2
{
static int _a; // Static fields:
static int _b;
static int _c;
public void X()
{
_a++; // Change static field values:
_b++;
_c++;
}
}

class Program
{
const int _max = 200000000;
static void Main()
{
Test1 test1 = new Test1(); // Instantiate instance fields
Test2 test2 = new Test2(); // Instantiate

var s1 = Stopwatch.StartNew();

for (int i = 0; i < _max; i++)
{
test1.X(); // Instance fields:
test1.X();
test1.X();
test1.X();
test1.X();
}
s1.Stop();

var s2 = Stopwatch.StartNew();

for (int i = 0; i < _max; i++)
{
test2.X(); // Static fields:
test2.X();
test2.X();
test2.X();
test2.X();
}
s2.Stop();

Console.WriteLine(((double)(s1.Elapsed.TotalMilliseconds * 1000 * 1000) / _max).ToString("0.00") + " ns");
Console.WriteLine(((double)(s2.Elapsed.TotalMilliseconds * 1000 * 1000) / _max).ToString("0.00") + " ns");
Console.ReadKey();
}
}