connecting to usb via c# program

[C# Programming]

End Google Ads 201810 - BS.net 01 --> hi there
im trying to connect to usb port with c#
i'm using the usb_lib
but i can't find my device (a simple D.O.K).
i try to loop the device_index from 0-1000
but i allways get the same strDevicePath seems to be the default one.
but i dont get the strDevicePath of the D.O.K
can anyone help???
thanks.