how do I shutdown my computer when multiple processes close?

Question

I'm trying to make an auto shutdown application that will shutdown the computer when multiple processes close.

Example: The user has a checklistbox that lists all of the current running processes. The user check marks all desired processes that they wish to monitor.Once all of these processes close then the computer is supposed to shutdown. I am having trouble doing this, I don't know how to make the program check to see if the checked process items have closed. Here is some code that I have right now, I would appreciate all the help anyone can give me.

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;
using System.Diagnostics;



namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private int counter;



        Process[] p = Process.GetProcesses();

        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Interval = 100;




            foreach (Process plist in p)
            {
                checkedListBox1.Items.Add(plist.ProcessName);
            }


        }


        private void timer1_Tick(object sender, EventArgs e)
        {

            counter = 0;
            checkedListBox1.Items.Clear();
            Process[] p = Process.GetProcesses();


            foreach (Process plist in p)
            {
                checkedListBox1.Items.Add(plist.ProcessName);
                counter = counter + 1;

            }

                if (counter == 0)
                {
                    MessageBox.Show("works");
                }

            }


        private void button1_Click(object sender, EventArgs e)
        {
            timer1.Enabled = true;
            timer1.Start();
        }



    }
}

Thanks,

-Angel Mendez

Answer 1

using System;
using System.Collections;
using System.Windows.Forms;
using System.Diagnostics;

namespace testprocessapp
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Process[] p = Process.GetProcesses();
            timer1.Interval = 10000;

            checkedListBox1.Items.Clear();

            foreach (Process plist in p)
            {
                checkedListBox1.Items.Add(plist.ProcessName);
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            int counter = 0;

            Process[] p = Process.GetProcesses();

            foreach (Process process in p)
            {
                foreach (var item in checkedListBox1.Items)
                {
                    if (item.ToString() == process.ProcessName)
                    {
                        counter = counter + 1;
                    }
                }
            }

            MessageBox.Show(counter == 0 ? "Your process has been terminated" : "Your process is still there");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ArrayList arrayList = new ArrayList();

            foreach (var checkedItem in checkedListBox1.CheckedItems)
            {
                arrayList.Add(checkedItem);
            }

            checkedListBox1.DataSource = arrayList;

            //button1.Enabled = false;
            button1.Text = "Monitoring...";

            timer1.Start();


        }
    }
}

I have now created a replica of the application. This code works.