Best way to open excel and save as CSV

Hi Everyone,
I am in need of opening an excel file and saving it as a CSV. There are going to be 100+ files which have to saved this way. What is a better solution for this?
Should I open excel application, Open files, save as csv, close excel
Open Excel, iterate through the files, save as CSV and then finally close excel

Any help is greatly appreciated.


Second option looks better one, because you are loading excel only once.