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[DllImport("user32")]
public static extern void keybd_event(int vk, byte bScan, int dwFlags, int dwExtraInfo);
const int VK_NUMLOCK = (int)Windows.Forms.Keys.NumLock;
const byte KEYEVENTF_KEYUP = 0x0002;
keybd_event(VK_NUMLOCK, 1, 0, 0);
keybd_event(VK_NUMLOCK, 0, KEYEVENTF_KEYUP, 0);
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