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using System;
using System.Security.AccessControl;
using System.Windows.Forms;
using Microsoft.Win32;
 
namespace WindowsFormsApplication4
{
    class c_RegistryKeyRechteÄndern_mit_Delete_
    {
        public void RegistryKeyErstellenAndRechteVergeben()
        {
            String user = "Jeder";
            String RegPath = "SOFTWARE\\_foo";
 
            RegistrySecurity rs = new RegistrySecurity();
 
 
            rs.AddAccessRule(new RegistryAccessRule(user,
                RegistryRights.FullControl | RegistryRights.Delete,
                InheritanceFlags.ContainerInherit,
                PropagationFlags.None,
                AccessControlType.Allow));
 
 
            // Create the example key with registry security.
            RegistryKey rk = null;
            try
            {
                rk = Registry.LocalMachine.CreateSubKey(RegPath,
                    RegistryKeyPermissionCheck.Default, rs);
                rk.SetValue("ValueName", "StringValue");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
 
            if (rk != null) rk.Close();
         }
     }

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try
{
  //wenn der Key schon existiert, wird er geöffnet, nicht neu erzeugt!
  using (RegistryKey rk = Registry.LocalMachine.CreateSubKey(RegPath, RegistryKeyPermissionCheck.Default))
  {
    rk.SetAccessControl(rs);    
  }
}
catch (Exception ex)
{
  Console.WriteLine(ex.Message);
}