May have helped if you posted in the correct forum, but anyway ...
check out the following link :
http://www.greggriffiths.org/webdev/both/excel/
Although not primarily aimed at .Net, it should provide enough info to get you going.
Alternatively try Google, which gives several links to MSDN articles on the very subject :
http://www.google.com/search?hl=en&l...1&q=excel+c%23
Opening excel worksheet in c#
