lexical analyzer in c sharp

Question

thanku for respose,....

it is a windows project..

i hope u knw the lexical analyzer, am plan to do this, just like, load the  program into a richtextbox, then split program with space and comma, and identify all the keywords, identifiers store in a file.
so now i load the splitted program into a richtextbox, i think take each line from the richtextbox and checking with an array, which contains stored all the keywords,  if find any keyword in that array, write that into a file.