Understanding the Web.Config File
The Web.Config file is an XML-based configuration file that's used by ASP.NET to set options for your application. Each new project you create has its own Web.Config file. Within a project, you can have multiple Web.Config files in different folders, setting up a hierarchy of what settings to use for each folder.
When you're just getting your feet wet with ASP.NET, you'll normally just use the one default Web.Config file on a per-project basis.
As you've seen in the previous section, you can use the Web.Config file to set application-level settings for state management. You can also set security on directories, set up page-and session-level debugging, and store your own custom configuration information.
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