Adding an internal service-like functionality to my web project (c#)

I need my web project to be able to do some sort of analysis on data it's being fed, the analysis is based on a chunk of data thats being fed to it as a learning routine (so I can set a specific baseline).

I need an efficient way for my web project to be able to analyze the baseline data and store it in memory after the initial analysis so that it can quickly reply according to the it - instead of having to process the baselining data in respone to each request.

What's the best way to do it?

I'm using VS with C#.