Communicate with USB port using C#

I worked a GUI project using C# for an audio company. This project needs PC GUI program communicate with a hardware board which has a USB port so that the GUI and the board switch data.

The hardware board has a micro controller chip (MCU), Actually it is Microchip's PIC. Then we know we can use PIC USB Bootloader in firmware side.

We can download Microchip's software package about PICDEM Full Speed USB evaluation kit.

And, There is a good guide article from Evan: PIC USB Bootloader using Microchip frimware and C#

Actually, our GUI program has little different way to communicate with PIC via USB port, let me find time to write later.