一个C#的定时关机程序，这个看上去更专业一些，它可按预定时间方式和倒计时方式关闭计算机，还可选择任务，希望新手朋友们下载参考一下。-The timing off a C# program, some of this looks more professional, it can form the scheduled time and the countdown to turn off the computer, and can also choose the task, I hope novic