can anyone explain me about device driver programs in detail?also explain me what language must be used in writing device driver program?

Writing device drivers is a subject all in itself. You would need to buy a book such as "Developing Windows NT Device Drivers" in order to obtain the necessary technical info, and possibly download Microsoft's Device Driver Development Kit as well.

Drivers are commonly written in C, although you might need some assembly language as well, but be warned: Device driver development is definitely not something to be tried unless you are well past the stage of regarding 1,000 line programs as large programs. If that isn't you, I would keep your money in your pocket instead of forking it out on an expensive book.