Download File from external website

I am trying to download an excel file from a site which is not my site. I have done the normal googling process to no avail which is why I am posting here. I need to navigate to a site and click a button that downloads an excel file.

I am using HttpWebRequest and HttpWebResponse to try to get the file but it is not working out to well. I can get the html text without a problem but simulating that click event just isn't working.

any ideas?