const int USB_DEVICE_DESCRIPTOR_TYPE = 1;

The USB_DESCRIPTOR_REQUEST structure is always followed by either a USB_STRING_DESCRIPTOR or USB_DEVICE_DESCRIPTOR structure.

The use of a a zero-length array at the end of the structure requires that you read and write "off the edge" of the structure. This concept is not well supported in C#/VB.Net so you have make sure that you allocate sufficient buffer space to accommodate a the USB_STRING_DESCRIPTOR or USB_DEVICE_DESCRIPTOR structure.

struct USB_DEVICE_DESCRIPTOR

Structure USB_DEVICE_DESCRIPTOR

typedef struct _USB_DEVICE_DESCRIPTOR {

} USB_DEVICE_DESCRIPTOR, *PUSB_DEVICE_DESCRIPTOR ;

   public USB_DEVICE_DESCRIPTOR DeviceDescriptor;

   USB_DEVICE_DESCRIPTOR  DeviceDescriptor;