trick webRequest?? how to code this??

If there is a website with a table of data in the middle of it, how do i write the code to perform a webrequest to extract the data only and put them in my database?
I already have code that doing a webrequest but it return the whole website, i don't want that, I only want the data in othe table only.
Is there anybody know how to do this?
thanx in advance for the helps