using System;

using System.Diagnostics;

public class Program

{

​

    public static void Main(string[] args)

        {

            Stopwatch sw = new Stopwatch();

            sw.Start();

            for (int i = 0; i < 10000000; i++)

            {

                var test = (string)Unboxing("someText");

            }

            sw.Stop();

            Console.WriteLine(string.Format("unboxing time {0}",sw.ElapsedMilliseconds)); 

​

​

            sw.Restart();

            for (int i = 0; i < 10000000; i++)

            {

                var test = generics<string>("someText");

            }

            sw.Stop();

            Console.WriteLine(string.Format("generics time {0}", sw.ElapsedMilliseconds)); 

​

            Console.ReadLine();

        }

​

        static object Unboxing(string text)

        {

            return text;

        }

​

        static T generics<T>(T text)

        {

            return text;

        }

}