using System;

using System.Diagnostics;

​

namespace ConsoleApp2

{

    public class Program

    {

        public static void Main(string[] args)

        {

            Stopwatch ss = new Stopwatch();

            ss.Start();

            for (int i = 0; i < 1000; i++)

            {

                for (int j = 0; j < 1000; j++)

                {

                    try

                    {

                        var x = multiply(i, j);

                    }

                    catch (OverflowException)

                    {

                    }

                }

            }

​

            ss.Stop();

            Console.WriteLine("Without checked " + ss.ElapsedTicks);

​

​

            ss = new Stopwatch();

            ss.Start();

            for (int i = 0; i < 1000; i++)

            {

                for (int j = 0; j < 1000; j++)

                {

                    try

                    {

                        var x = multiplyChecked(i, j);

                    }

                    catch (OverflowException)

                    {

                    }

                }

            }

​

            ss.Stop();

            Console.WriteLine("With checked " + ss.ElapsedTicks);

            Console.ReadLine();

        }

​

        private static int multiply(int i, int j)

        {

            if ((long)i * (long)j > int.MaxValue)

            {

                throw new OverflowException("overflow");

            }

​

            return i * j;

        }

​

        private static int multiplyChecked(int i, int j)

        {

            return checked(i * j);

        }

    }

}

​