Deny

   


using System;
using Microsoft.Win32;
using System.Security.Permissions;

class Class1 {
    static void Main(string[] args) {
        RegistryPermission regPermission = new RegistryPermission(RegistryPermissionAccess.AllAccess, "HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersion");
        regPermission.Deny();


        RegistryKey myRegKey = Registry.LocalMachine;
        myRegKey = myRegKey.OpenSubKey("SOFTWAREMicrosoftWindows NTCurrentVersion");
        Object oValue = myRegKey.GetValue("RegisteredOwner");
        Console.WriteLine("OS Registered Owner: {0}", oValue.ToString());
    }
}