need site map for C# .Net website

Question

The guy who created the website did not stay here and pretty much did not document any code or leave a site map.  Right now I am having problems figuring where to locate things such as the Core folder or file that is drawing info from the database.  How to get info into the database.  How the pages are using the database to update info.  Also, where the HTML code that I see on the live site under view source is being generated from.  Without the documentation it is futile to find where to make coding changes to do what needs to be done.  Something as simple as changing text has become a nightmare because of the different AdServer and DataServer pages and all the .dll files.  Is there anyway without this guy's help to create a site map for these things in Visual Studio .Net?  Please help.  Thanks.  My yahoo id is mjlash8 if it would  be too much for a posting.