You've to have referenced the SDK COM and namespace ZKFPengController first
and an object called ZKFPEngX1 which is going to use reference On finger touching
private void ZKFPEngX1_OnFingerTouching(object sender, EventArgs e)
{
lblState.Text = "TOUCH";
ZKFPEngX1.ControlSensor(13, 1);
ZKFPEngX1.ControlSensor(13, 0);
}
FirstNumber 13 means BEEP sound
SecondNumber 1 means Begin
SecondNumber 0 means End
that worked for me in VS C# 2013
best regards