Commonly Used Objects and Classes in ASP.NET
Now that you have an idea of what files are used in an ASP.NET application and you have been introduced to VisualBasic. NET,Web Forms, and pages, it is time to look at some essential objects that are used by ASP.NET applications.
The Application Intrinsic Object (HttpApplication Class)
The HttpApplication class defines the methods, properties, and events common to all HttpApplication objects within the ASP.NET Framework.
The HttpApplication class contains many other classes as properties that users of Classic ASP will recognize, but others that they will not. Because the application object is integral to the development of a web application or site, it covers a lot of ground.