未创建注册表项

我已经没有麻烦创建/删除密钥到CurrentUser，但每当我尝试LocalMachine什么都没有发生。我已经将("requestedExecutionLevel level="requireAdministrator" uiAccess="false")添加到app.manifest中。我错过什么了吗?

    private void button1_Click(object sender, EventArgs e)
    {
        RegistryKey rKey;
        rKey = Registry.LocalMachine.OpenSubKey("Software", true);
        rKey.DeleteSubKey("test", true);
        rKey.Close();            
    }
    private void button2_Click(object sender, EventArgs e)
    {
        RegistryKey rKey;
        rKey = Registry.LocalMachine.OpenSubKey("SOFTWARE", true);
        rKey.CreateSubKey("test");
        rKey.Close();
    }