how to upload our products into amezon site with .net app

hi all,
i have seller account in amazon site i want to upload all my products information in the site which is in .csv format .for this in my search i found one method that is "marketplace Webservice" by amazon but since from 3 days i didn't get that webservice url. if you have any idea regarding this please let it help to me.

Thanks & Regards,
M.koteswara Rao.