ASP.NET in a Nutshell

Name

HttpApplication

Synopsis

HttpApplication is the default base class from which your web application derives. This class is most notable for the application-level events it provides. You can code event handlers that react to global application events in the global.asax file. If you use Visual Studio .NET to create a code-behind class (like global.asax.vb), the event handler code will be created in a class called Global, which inherits from HttpApplication. Note that the application event handlers are not connected with a Handles keyword or AddHandler() statement. Instead, they are recognized by their method names, which must match the event name and be preceded by “Application_” (as in Application_AuthenticateRequest or Application_EndRequest).

The first time a user navigates to a page in your application, the ASP.NET engine creates a pool of HttpApplication objects. Whenever your application receives a request, the ASP.NET engine automatically assigns one of these HttpApplication instances to serve the request. This HttpApplication instance will be reused, but only once the request is complete.

Public Class HttpApplication : Implements IHttpAsyncHandler, IHttpHandler, System.ComponentModel.IComponent,_
       IDisposable
' Public Constructors
   Public Sub New() 
' Public Instance Properties
   Public ReadOnly Property Application As HttpApplicationState  
   Public ReadOnly Property Context As HttpContext  
   Public ReadOnly Property Modules As HttpModuleCollection  
   Public ReadOnly Property Request ...