how to check if a listbox does not contain any items from a checklistbox?

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C#

Windows

WinForms

checkbox

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Hi,

I have a listbox and a checklistbox with items in it. I want to show a messagebox when the listbox does not contain any items form the checklistbox, Thanks.

I'm making an auto shutdown application that will shutdown when a process is done. The user clicks the items on a checklistbox that they want to monitor the item is added to a listbox.Then you click on a button to start the timer. Then when the timer is up it will check to see if the processes is still running by compairing the listbox with the checklistbox items. The problem is im unable to compare both list. I'm not sure if it could be the timer or the lists. please take a look at my code.

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();
        }

        int timer;
        bool timerstart = false;

        Process[] pro = Process.GetProcesses();

        private void Form1_Load(object sender, EventArgs e)
        {
            foreach (Process prolist in pro)
            {
                checkedListBox1.Items.Add(prolist.ProcessName);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            timer1.Enabled.Equals(true);
            timer1.Start();
            timerstart = true;
            MessageBox.Show("timer started");
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (timerstart == true)
            {
                timer = timer = -1;
            }
            if (timer == 0)
            {
                checkedListBox1.Items.Clear();

                foreach (Process prolist in pro)
                    checkedListBox1.Items.Add(prolist.ProcessName);
                {
                    bool notFound = true;
                    checkedListBox1.Items.Cast<string>().Select(s =>
                    {
                        if (listBox1.Items.Cast<string>().Any(ls => ls.Equals(s, StringComparison.InvariantCultureIgnoreCase)))
                            notFound = false;
                        return s;
                    });
                    if (notFound)
                        MessageBox.Show("Not found");
                    {
                        timer = timer + 5;
                    }
                }
            }
        }


        private void button2_Click(object sender, EventArgs e)
        {
            timer1.Stop();
            timerstart = false;
            MessageBox.Show("timer stopped");
        }

        private void button3_Click(object sender, EventArgs e)
        {
            checkedListBox1.Items.Clear();

            Process[] pro = Process.GetProcesses();
            foreach (Process prolist in pro)
            {
                checkedListBox1.Items.Add(prolist.ProcessName);
            }
        }

        private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
        {
            listBox1.Items.Add(checkedListBox1.SelectedItem);
        }
    }
}

I know its messy and there is a better way to do this but I'm a beginner, Thanks.