UsbUirt.Controller.OpenDriver C# (CSharp) Method

        private IntPtr OpenDriver()
        {
            IntPtr hDrvHandle = UUIRTOpen();
            //	hDrvHandle = (IntPtr)INVALID_HANDLE_VALUE;
            if (hDrvHandle.ToInt32() == INVALID_HANDLE_VALUE) {
                switch (Marshal.GetLastWin32Error()) {
                    case (int) UuirtDriverError.NoDll:
                        throw new ApplicationException("Unable to find USB-UIRT Driver. Please make sure driver is Installed");

                    case (int) UuirtDriverError.NoDeviceFound:
                        throw new ApplicationException("Unable to connect to USB-UIRT device! Please ensure device is connected to the computer");

                    case (int) UuirtDriverError.NoResponse:
                        throw new ApplicationException("Unable to communicate with USB-UIRT device! Please check connections and try again.  If you still have problems, try unplugging and reconnecting your USB-UIRT.  If problem persists, contact Technical Support");

                    case (int) UuirtDriverError.WrongVersion:
                        throw new ApplicationException("Your USB-UIRT's firmware is not compatible with this API DLL. Please verify you are running the latest API DLL and that you're using the latest version of USB-UIRT firmware!  If problem persists, contact Technical Support");
                }

                throw new ApplicationException("Unable to initialize USB-UIRT (unknown error)");
            }
            return hDrvHandle;
        }