process data sent by program

Question

I want my c# program to send an ID string that it gets from the computer where it's running to my web site and I want the web site to respond with a string that it generates by performing an algorithm on the original ID string.  I'm brand new to web site development so go easy on me.  My web site is in ASP.net C#.

I apologize if this is the wrong place for this question or if it's been answered somewhere else, but I'm not sure where to go and can't find the answer anywhere else.

Thanks