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//Dieser Code liest die Unterschlüssel von HKLM/Software aus und schreibt diese in meine Textbox

using System;
using System.Windows.Forms;
using Microsoft.Win32;
 
namespace RegistryKeysLesen
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            string oRegBas = @"\SOFTWARE\Wow6432Node\Clients\Mail";
 
            textBox1.Multiline = true;
            textBox1.ScrollBars = ScrollBars.Vertical;
 
            using (RegistryKey MeinKey = Registry.LocalMachine.OpenSubKey(oRegBas))
            {
                try
                {
                    //for each registry-entry ...
                    foreach (string i in MeinKey.GetSubKeyNames())
                    {
                        textBox1.Text += i + "\r\n"; 
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }
    }
}