C# 定时关机代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PCShutDown
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            
        }

        string cmd = @"c:\Windows\System32\shutdown.exe";

        /// 

        /// 锁定电脑
        /// 
        [DllImport("User32.DLL")]
        public static extern void LockWorkStation();
        private void btn_Lock_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("确定要锁定电脑吗?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
            {
                LockWorkStation();
            }
        }

        /// 

        /// 重启电脑
        /// 
        /// 
        /// 
        private void btn_Reboot_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("确定要重记电脑吗?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
            {

                System.Diagnostics.Process.Start("shutdown.exe", " -r -t 60");
            }
        }
        /// 

        /// 关机
        /// 
        /// 
        /// 
        private void btn_Shutdown_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("确定要关机吗?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
            {
                System.Diagnostics.Process.Start("shutdown.exe", " -s -t 60");
            }
        }

        /// 

        /// 取消操作
        /// 
        /// 
        /// 
        private void btn_Cancel_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("确定要取消吗?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
            {
                System.Diagnostics.Process.Start("shutdown.exe", " -a");
                textBox1.AppendText("提示: 操作时间:" + DateTime.Now.ToString() + " 任务已取消" + "\r\n");
            }

        }


        /// 

        /// 休眠
        /// 
        /// 
        /// 
        /// 
        /// 

        [DllImport("PowrProf.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern bool SetSuspendState(bool hiberate, bool forceCritical, bool disableWakeEvent);

        private void button2_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("确定进入睡眠模式吗?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
            {
                SetSuspendState(true, true, true);
            }

            showTime.Text = GetStartTime().ToString();
        }


      

    }
}