using System;

using System.Diagnostics;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        Stopwatch timer=new Stopwatch();

        int [] marks = new int[1]  { 99};

            timer.Reset();

            timer.Start();

            var data=   marks.SingleOrDefault();

            Console.WriteLine(data);

            Console.WriteLine("Time Taken: "+  timer.ElapsedTicks.ToString());

            timer.Stop();

            timer.Reset();

            timer.Start();

            var data1=  marks.FirstOrDefault();

            Console.WriteLine(data1);

            Console.WriteLine("Time Taken: "+  timer.ElapsedTicks.ToString());

            timer.Stop();

    }

}