using System;

using System.Diagnostics;

public class Program

{

    public static void Main()

    {

        var stopwatch = new Stopwatch();

        TestConcats(stopwatch, 100);

        TestConcats(stopwatch, 1000);

        TestConcats(stopwatch, 10000);

        TestConcats(stopwatch, 100000);

    }

    private static void TestConcats(Stopwatch stopwatch, int iterations)

    {

        var testString = String.Empty;

        stopwatch.Start();

        for (int i = 0; i < iterations; ++i)

        {

            testString += "Blah";

        }

        stopwatch.Stop();

        Console.WriteLine($"{iterations} concats took: {stopwatch.Elapsed}");

        stopwatch.Reset();

    }

}