C# delete a registry key, cannot get it done

@ Ryan Zahra: Thanks for your feedback, but like I stated I'm a newbie not known in programming.
I got far in what I wanted to achieve allready (Got my app. up and running, IO created a new smart device app to integrate use of registry and get stuck here), but without basic programming knowledge I sometimes don't have a clue where or how to fix my errors. So In short your answer did not help me out much further.

@Johannesnestler:
I voted 3 because I'm very happy with your feedback, but it seems to be for a console app.
I tryed quicly to use your code for use in a smartdevice WM6.1/5.0 app. but it gave me an exception error upon running.
The soon I have time to look the code after and applying it in my registry test app, I'll update this tread, wife and kids and work generate a lot of work. This is hobby/work related.
but again, thanks for your feedback.

I'll get back to this after the weekend I think.

Regards,

Frans

Added underneath as solution 3 but deleted

Johannes Thankz again, for showing complete code..

thanks for pointing my mistake on the localmachine / Currentuser issue

OK tryed several things on deleting subkey subkeytree
Keep getting UnauthorizedAccessException message while the line of deleting the subkey is run.
To test if it's there yes/no works write it, but deleting gives unautorized access

Tested on my laptop running windows 7pro with a windows form app.
The same buttons:

1: write key
2: check key: if it exists: messagebox YES, if NOT message box: NO
3: delete key
Using localmachine it gives an access error.
using current user the underneath code works fine (Windows form app.)

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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 Microsoft.Win32;

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

private void btn_RK_create_Click(object sender, EventArgs e)
{
//using Microsoft.Win32;
// Write key "test" with subkey "DeleteMe"
RegistryKey versie1 = Registry.CurrentUser.CreateSubKey("Software\\test\\DeleteMe");
// versie1.SetValue("Version", "1");
versie1.Close();
}

private void btn_RK_present_Click(object sender, EventArgs e)
{
RegistryKey rk = Registry.CurrentUser.OpenSubKey("Software\\test\\DeleteMe");

if (rk != null)
{
MessageBox.Show("YES");// It's there
}
else
{
MessageBox.Show("NO");// It's not there
}
}

private void btn_RK_del_Click(object sender, EventArgs e)
{
// Open SOFTWARE
RegistryKey versie1 = Registry.CurrentUser.OpenSubKey("Software", true);
// Delete "DeleteMe" from SOFTWARE
versie1.DeleteSubKeyTree("test");
//Close the registry SubKey and flush
versie1.Close();
}
}
}

Now if I use the same code for a windows wm5.0 app. it runs but gives me an Unautorized Access Exception error while running the line "versie1.DeleteSubKeyTree("test");"


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<pre lang="msil">using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;
namespace RegistryKeys_TEST
{
public partial class Frm_REG_TEST : Form
{
public Frm_REG_TEST()
{
InitializeComponent();
}

private void btn_write_key_Click(object sender, EventArgs e)
{
//using Microsoft.Win32;
// Write key "test" with subkey "DeleteMe"
RegistryKey versie1 = Registry.CurrentUser.CreateSubKey("Software\\test\\Deleteme");
// versie1.SetValue("Version", "1");
versie1.Close();
}
private void btn_rk_exist_Click(object sender, EventArgs e)
{
RegistryKey rk = Registry.CurrentUser.OpenSubKey("Software\\test\\Deleteme");
if (rk != null)
{
MessageBox.Show("YES");// It's there
}
else
{
MessageBox.Show("NO");// It's not there
}
}
private void REG_TEST_L_exit_Click(object sender, EventArgs e)
{
// exit app.
Application.Exit();
}
private void REG_TEST_R_form2_Click(object sender, EventArgs e)
{
// Ga naar Form 2, 2eform kan alles zijn.
Form2 nogeenform = new Form2();
nogeenform.Show();
}
private void btn_del_key_Click(object sender, EventArgs e)
{
{
// Open SOFTWARE
Regis