I have notice my company website has a sitemap.aspx, will that be the same as the sitemap generated for google which is in .xml format? Also am I able to upload that using Google Webmaster tools? Thanks in advance.
It's probably just a standard HTML sitemap (HTML sitemaps may be created in PHP, ASP.Net or whatever, but the output is still HTML) You could let us know the full link?
HTML sitemaps are different from Google sitemaps. You need to generate a XML sitemap and then add in Google webmaster tools