private void USBPort_USBDeviceAttached(objectsender,
USBClass.USBDeviceEventArgs e)
{
if (!MyUSBDeviceConnected)
{
if(USBClass.GetUSBDevice(MyDeviceVID, MyDevicePID,
ref USBDeviceProperties, false))
{
 //My Device is connected
MyUSBDeviceConnected = true;
}
}
}

private void USBPort_USBDeviceRemoved(objectsender,
USBClass.USBDeviceEventArgs e)
{
if(!USBClass.GetUSBDevice(MyDeviceVID, MyDevicePID,
ref USBDeviceProperties, false))
{
//My Device is removed
MyUSBDeviceConnected = false;
}
}