i am looking for usb communication using c# with PIC18f4550. And i very new to C#.
i go through **broken link removed**
site but not getting some concept so is there any video tutorial for that??
USB communication is device class specific. You'll first decide for a device class and implement it in your PIC firmware, e.g. serial communication (CDC) or HID. Then access it through respective Windows drivers.
Did you really read the USB central pages thoroughly, e.g. the link Making USB C# friendly?
in the USB directory you will find an number of example projects many of which include C++, VB and C# host code to communicate with the target PIC microcontroller