thanks for help. and I know basic info about threading and serial port. but the main problem is in my project computer has to recieve signals from device in continous manner. Its like embedded tech. so new for that. thats why confused. cant find your email link so have to put on general blog. if you dont mind give me your email id so i can send you my problem. but thanks a lot.

as the other device is "not a computer" I doubt XML is the way to go. Chances are the device has limited capabilities (limited CoreMark, few KBs of RAM, hardly an OS, C only, ...) and will dictate the way to go. we'll have to wait and see. FWIW: Most of the time I avoided exchanging float data with small embedded systems; choosing an appropriate scale maps most physical stuff easily onto 16-bit integers. :) Luc Pattyn [Forum Guidelines] [My Articles] DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.

Hi, Use WCF if these 2 projects are running in different app domains. Ensure to, -Use Named Pipe binding (I assume that both are winform applications and running on same machine) -Implement duplex contract for notifications. Let me know if you need help for implementing this.