using System;

using System.Diagnostics;

public class C

{

}

​

public class C2 : C {}

public class C3 : C2 {}

public class C4 : C3 {}

public class C5 : C4 {}

​

public class Program

{

    public static bool CheckWithIs<T>(object o)

    {

        return o is T;

    }

    public static bool CheckWithGetType<T>(object o)

    {

        return o.GetType() == typeof(T);

    }

    private const int Iterations = 10_000_000;

    public static void Benchmark<T>(object o)

    {

        var stopwatch = new Stopwatch();

        stopwatch.Start();

        for (var i = 0; i < Iterations; ++i)

        {

            CheckWithIs<T>(o);

        }

        stopwatch.Stop();

        var elapsed = stopwatch.Elapsed;

        Console.WriteLine($"{nameof(CheckWithIs)} -- {elapsed:g}");

        stopwatch.Start();

        for (var i = 0; i < Iterations; ++i)

        {

            CheckWithGetType<T>(o);

        }

        stopwatch.Stop();

        elapsed = stopwatch.Elapsed - elapsed;

        Console.WriteLine($"{nameof(CheckWithGetType)} -- {stopwatch.Elapsed:g}");

    }

    public static void Main()

    {

        object c = new C();

        object c5 = new C5();

        Benchmark<C>(c);

        Benchmark<C5>(c5);

        Benchmark<C5>(c);

        Benchmark<C>(c5);

    }

}