using System;

using System.Linq;

using System.Collections.Generic;

using System.Diagnostics;

public class Program

{

    public static void Main()

    {

        Stopwatch stopwatch = new Stopwatch();

​

        stopwatch.Start();

        TestMethodA();

        stopwatch.Stop();

        TimeSpan elapsedTimeA = stopwatch.Elapsed;

        Console.WriteLine("Elapsed time for Test A: " + elapsedTimeA);

        stopwatch.Reset();

        stopwatch.Start();

        TestMethodB();

        stopwatch.Stop();

        TimeSpan elapsedTimeB = stopwatch.Elapsed;

        Console.WriteLine("Elapsed time for Test B: " + elapsedTimeB);

    }

    public static bool TestMethodA()

    {

        var cats = new List<string>()

        {

            "AbcAbc",

            "DefDef",

            "GhiGhi",

            "JklJkl",

            "MnoMno",

            "PqrPqr",

            "StuStu",

            "VwxVwx",

            "YzzYzz"

        };

        if (cats.Any(x => x.ToLower().Contains("yzzyzz")))

        {

            return true;

        }

        return false;

    }

    public static bool TestMethodB()

    {

        var cats = new List<string>()

        {

            "AbcAbc",

            "DefDef",

            "GhiGhi",

            "JklJkl",

            "MnoMno",

            "PqrPqr",

            "StuStu",

            "VwxVwx",

            "YzzYzz"

        };

        if (cats.Any(x => x.IndexOf("yzzyzz", StringComparison.OrdinalIgnoreCase) >= 0))

        {

            return true;

        }

        return false;

    }

}