what is the alternate to windows indexing service (asp.net 2.0) ?

Question

I m working on a web project and I need do file content  searching on DOC and PDF .
Due to some reason I cant use windows indexing service How I can do it with out crawling

each and every file from directory to directory and then reading them from start to end and

each time a file gets changes or added new file to search directory the search engin shoul

automatically detects the changes. How I can do it . If not

how can i restart my search catalog in windows indexing service programmtically.

surely there will be a solution to this problem kindely help me How I will be able to do it


hyder_master