Well you can just give a link to the pdf file corresponding to your website directory structure and the clients can see the file when they click the link, if they have Adobe Reader (or other pdf readers) installed.
But there is a better way. You can show pdf files without Acrobat Reader installed on client or server. And the solution is right here in CodeProject. Read this article -
ASP.NET PDF Viewer User Control Without Acrobat Reader Installed on Client or Server
BTW, search Google/Bing for "show pdf file web page" and you will get many examples.