Enable and Disable Ctrl+Alt+Delete

public void KillCtrlAltDelete()
{
RegistryKey regkey;
string keyValueInt = "1";
string subKey = "Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System";

try
{
regkey = Registry.CurrentUser.CreateSubKey(subKey);
regkey.SetValue("DisableTaskMgr", keyValueInt);
regkey.Close();
}
catch (Exception ex)
{

}
}

public void EnableCtrlAltDelete()
{
string subKey = "Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System";
try
{
Registry.CurrentUser.DeleteSubKey(subKey);
}
catch( Exception ex)
{

}
}