计算某一段程序消耗的内存和时间【C#】

using System;
using System.Diagnostics;
namespace Action
{
    class Program
    {
        static void Main(string[] args)
        {
            GC.Collect();//清理一下先
            Random ra = new Random();
            int count = 1000000;//100W
            DateTime start = DateTime.Now;
            for (int i = 0; i < count; i++)
            {
                new String(""+i);
            }
            DateTime end = DateTime.Now;
            double usedMemory = Process.GetCurrentProcess().WorkingSet64 / 1024.0 / 1024.0;
            Console.WriteLine("耗时：" + (end - start).TotalMilliseconds + "毫秒");
            Console.WriteLine("消耗内存:" + usedMemory + "M");
        }
    }
}