How to delete 64 bit Registry keys/values (.NET 3.5)

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 X64RegOps
{
    public partial class Form1 : Form
    {
        enum BaseKeys
        {
            HKEY_LOCAL_MACHINE,
            HKEY_CURRENT_USER,
            HKEY_CLASSES_ROOT,
            HKEY_USERS,
            HKEY_CURRENT_CONFIG
        }

        public Form1()
        {
            InitializeComponent();
            comboBox1.SelectedIndex = 0;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(textBox1.Text))
            {
                MessageBox.Show("Subkey value is empty...");
                return;
            }

            UIntPtr basekey = GetX64BaseKey(comboBox1.Text);
            string subkey = textBox1.Text;

            DeleteKey(basekey, subkey);
        }

        protected UIntPtr GetX64BaseKey(string basekeystr)
        {
            UIntPtr baseKey = UIntPtr.Zero;
            if (basekeystr.Equals(BaseKeys.HKEY_LOCAL_MACHINE.ToString()))
                baseKey = RegistryInterop.HKEY_LOCAL_MACHINE;
            else if (basekeystr.Equals(BaseKeys.HKEY_CURRENT_USER.ToString()))
                baseKey = RegistryInterop.HKEY_CURRENT_USER;
            else if (basekeystr.Equals(BaseKeys.HKEY_CLASSES_ROOT.ToString()))
                baseKey = RegistryInterop.HKEY_CLASSES_ROOT;
            else if (basekeystr.Equals(BaseKeys.HKEY_USERS.ToString()))
                baseKey = RegistryInterop.HKEY_USERS;
            else if (basekeystr.Equals(BaseKeys.HKEY_CURRENT_CONFIG.ToString()))
                baseKey = RegistryInterop.HKEY_CURRENT_CONFIG;

            return baseKey;
        }

        // Delete a subkey (a registry tree) from HKEY_LOCAL_MACHINE
        private void DeleteKey(UIntPtr basekey, string subkey)
        {
            // Open HKEY_LOCAL_MACHINE
            using (X64RegistryKey baseRegkey = new X64RegistryKey(basekey))
            {
                UIntPtr key = UIntPtr.Zero;
                if (X64RegistryKey.SUCCESS == baseRegkey.Open(subkey, out key)) // open the subkey under HKEY_LOCAL_MACHINE\subkey to delete it
                {
                    using (X64RegistryKey regkey = new X64RegistryKey(key))
                    {
                        regkey.DisableReflection();    // call this method to disable registry reflection, so that the 64bit registry can be deleted
                        regkey.RegDeleteTree(subkey);
                    }
                }
            }
        }
    }
}