Getting All Installed Programs From Windows Registry Using Multi-Threading

GetInstalledApps.cs

using Microsoft.Win32;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;

namespace TestCSharpApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            MainMethod();
        }
        public List<string> result = new List<string>();
        public BackgroundWorker bgWorker = new BackgroundWorker();
        public delegate void DelegateCallback(string s);
        private void MainMethod()
        {
            bgWorker.DoWork += BgWorker_DoWork;
            bgWorker.RunWorkerCompleted += BgWorker_RunWorkerCompleted;
            bgWorker.RunWorkerAsync();
        }

        private void BgWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            bgWorker.DoWork -= BgWorker_DoWork;
            bgWorker.RunWorkerCompleted -= BgWorker_RunWorkerCompleted;
        }

        private void BgWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            result = Get_Installed_Software.GetInstalled_Programs();
            if (result != null)
            {
                result.ForEach((string item) => listBox1.Invoke(new DelegateCallback(UpdateUI),
                          new string[] { item })); /* Use string.split to split at "," */
            }
        }
        private void UpdateUI(string item)
        {
            listBox1.Items.Add(item);
        }

    }
    public static class Get_Installed_Software
    {
        private const string reg_key = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";

        public static List<string> GetInstalled_Programs()
        {
            List<string> program_Values = new List<string>();
            program_Values.AddRange(ReadProgram_Instalations(RegistryView.Registry32));
            program_Values.AddRange(ReadProgram_Instalations(RegistryView.Registry64));
            return program_Values;
        }

        private static IEnumerable<string> ReadProgram_Instalations(RegistryView registryView)
        {
            List<string> program_Values = new List<string>();
            using (RegistryKey key = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, registryView).OpenSubKey(reg_key))
            {
                for (int i = 0; i < key.GetSubKeyNames().Length; i++)
                {
                    using (RegistryKey subkey = key.OpenSubKey(key.GetSubKeyNames()[i]))
                    {
                        if (All_KeyValues_Exist(subkey))
                        {
                            program_Values.Add(string.Concat((string)subkey.GetValue("DisplayName"), ", ", (string)subkey.GetValue("Publisher"), ", ", (string)subkey.GetValue("InstallLocation")));
                        }
                    }
                }
            }
            return program_Values;
        }

        private static bool All_KeyValues_Exist(RegistryKey subkey)
        {
            string app_Name = (string)subkey.GetValue("DisplayName");
            string publisher_Name = (string)subkey.GetValue("Publisher");
            string installLocation = (string)subkey.GetValue("InstallLocation");
            if (string.IsNullOrEmpty(app_Name) || string.IsNullOrEmpty(publisher_Name) || string.IsNullOrEmpty(installLocation))
                return false;
            else
                return true;
        }
    }
}