C#调用shutdown 来关机

  

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        int i = 0;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            shud.Items.Add("模式一");
            shud.Items.Add("模式二");
            groupBox1.Enabled = false;
            groupBox2.Enabled = false;
            for (int i = 0; i < 60; i++)
            {
                ok.Items.Add(i.ToString()); 
            }

            for (int i = 0; i <= 24; i++)
            {
                c1.Items.Add(i.ToString());
            }
            for (int i = 0; i <= 60; i++)
            {
                c2.Items.Add(i.ToString());
                c3.Items.Add(i.ToString());
                c6.Items.Add(i.ToString());
                c5.Items.Add(i.ToString());

            }
            for (int i = System.DateTime.Now.Hour; i <= 24; i++)
            {
                c4.Items.Add(i.ToString());
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {               
            int h = 0, m = 0;
            string dingshi="";
            timer1.Enabled = true;
            timer1.Interval = 1000;
            if (groupBox2.Enabled)
            {

                int ss = 0;
                int mm = 0;
                int hh = 0;
                try
                {
                    ss = Convert.ToInt16(c3.Text) + System.DateTime.Now.Second;
                    mm = Convert.ToInt16(c2.Text) + System.DateTime.Now.Minute;
                    hh = Convert.ToInt16(c1.Text) + System.DateTime.Now.Hour;
                }
                catch (Exception)
                {

                    MessageBox.Show("请输入时间");
                }

                dingshi = "";

                if (ss >=59)
                {
                    m = ss / 60;
                }
                string dingshi1 = (ss - 60 * m).ToString() + "秒";
                if (mm>=59)
                {
                    h = mm / 60;
                }
                string dingshi2 = ((mm + m) - (h * 60)).ToString() + "分";
               
                string dingshi3 = (hh + h).ToString() + "时";
                if (hh + h >= 24)
                    dingshi3 = ((hh + h) - 24).ToString()+"时";
                    dingshi = dingshi3 + dingshi2 + dingshi1;
            }

            else if (groupBox1.Enabled)
            {
                dingshi = "";
                dingshi = c4.Text + "时" + c5.Text + "分" + c6.Text + "秒";
            }
            else
                MessageBox.Show("请选择模式！");

                label13.Text = dingshi;

        }
       
        private void timer1_Tick(object sender, EventArgs e)
        {
            i++;
            label3.Text = System.DateTime.Now.Hour.ToString() + "时" + System.DateTime.Now.Minute.ToString() + "分" + System.DateTime.Now.Second.ToString() + "秒";
            if (label3.Text == label13.Text)
            {
              playmusic();
              timer2.Enabled = true;
              timer2.Interval =1000;
            }
        }

        void shutdown()
        {
            System.Diagnostics.Process.Start("shutdown", "-s -t 0");    //调用windows的shutdown来关机
        }

        private void shud_SelectedIndexChanged(object sender, EventArgs e)
        {
            if(shud.Text=="模式一")
            {
                close();
            groupBox2.Enabled=true;

            }
            else if(shud.Text=="模式二")
            {
                close();
            groupBox1.Enabled=true;
            }
        }

        void close()
        {
            groupBox1.Enabled = false;
            groupBox2.Enabled = false;
       
        }

        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            System.Diagnostics.Process.Start("http://user.qzone.qq.com/979170768/infocenter");    //进入网站
            //System.Diagnostics.Process.Start("http://user.qzone.qq.com/1253215326?ADUIN=979170768&ADSESSION=1307263507&ADTAG=CLIENT.QQ.3439_FriendTip.0&ptlang=2052");
        }

        private void playmusic()     //关机前的音乐
        {
            string path = Application.StartupPath;
            path = path.Replace("bin\\Debug", "Resources\\midi\\");
            if (chose_music.Text != "")
                path = path + chose_music.Text + ".mid";
            this.axWindowsMediaPlayer1.URL = path;
            this.axWindowsMediaPlayer1.Ctlcontrols.play();
             axWindowsMediaPlayer1.settings.setMode("loop", true);  //循环播放
       }

        private void button1_Click_1(object sender, EventArgs e)
        {
            Button b=(Button)sender;
            if(b.Text=="试听")
            {
                playmusic();
            button1.Text="停止";
            }
            else
            {
                axWindowsMediaPlayer1.Ctlcontrols.stop();
              button1.Text="试听";
            }
              
           

        }

        private void timer2_Tick(object sender, EventArgs e)    //开始计时
        {
            i++;
             if(i>=Convert.ToInt16(ok.Text))   //时间到
             {
             shutdown();   //调用自己定义的函数进行关机
             Close();
             Application.Exit();
           
            
             }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            Close();
            Application.Exit();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            MessageBox.Show("关于软件说明如下：本软件为尹国涛同学开发，属于个人爱好，如果有什么问题请加QQ:979170768，与我联系，2011,6,5","说明");
        }

        private void label18_Click(object sender, EventArgs e)
        {
            Hide();
        }

        private void label19_Click(object sender, EventArgs e)
        {
            //Form2 f2 = new Form2();
            //f2.Show();
        }
    }