application in c sharp

 If yes, you need to read about NLP (natural Language processing)

Here is a link which does almost same thing of your requirement:

http://www.codeproject.com/Articles/12109/Statistical-parsing-of-English-sentences

Do you want some program/ idea which parse (breaks down) a sentence into its part of speech ...like in the following links:

http://zzcad.com/parse.htm
http://www.link.cs.cmu.edu/link/submit-sentence-4.html