C# 控制小键盘锁 numlock

[DllImport("user32.dll")]
        static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);
        const int KEYEVENTF_EXTENDEDKEY = 0x1;
        const int KEYEVENTF_KEYUP = 0x2;
        public Form2()
        {
         
           keybd_event((byte)Keys.NumLock, 0, KEYEVENTF_EXTENDEDKEY, 0);//锁上小键盘
           //  keybd_event((byte)Keys.NumLock, 0, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);//2条语句都可以实现，这2条语句都执行则解锁
        
            InitializeComponent();
       
        }