DataTime.Now.Ticks的应用

参考：http://www.cnblogs.com/delphinet/archive/2011/06/09/2075985.html

转换成秒：

using System;
using System.Collections.Generic;  

class Sentence
{
  static void Main()
  {
    long ticks0 = DateTime.Now.Ticks;
    for (int i = 0; i < int.MaxValue; i++)
    {
      // ...
    }
    long ticks1 = DateTime.Now.Ticks;
    double n = (ticks1 - ticks0) / 10000000.0;
    Console.WriteLine("上面这段程序运行了{0}秒", n);
  }
}