ASP.NET.in.a.Nutshell.Second.Edition [Electronic resources]

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.

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  : IHttpAsyncHandler, IHttpHandler, System.ComponentModel.IComponent, IDisposable {
// Public Constructors
public 
HttpApplication ( );
// Public Instance Properties
public HttpApplicationState 
Application {get; }
public HttpContext 
Context {get; }
public HttpModuleCollection 
Modules {get; }
public HttpRequest 
Request {get; }
public HttpResponse 
Response {get; }
public HttpServerUtility 
Server {get; }
public HttpSessionState 
Session {get; }
public ISite 
Site {set; get; }                    // implements System.ComponentModel.IComponent
public IPrincipal 
User {get; }
// Protected Instance Properties
protected EventHandlerList 
Events {get; }
// Public Instance Methods
public void 
AddOnAcquireRequestStateAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
AddOnAuthenticateRequestAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
AddOnAuthorizeRequestAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
AddOnBeginRequestAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
AddOnEndRequestAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
AddOnPostRequestHandlerExecuteAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
AddOnPreRequestHandlerExecuteAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
AddOnReleaseRequestStateAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
AddOnResolveRequestCacheAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
AddOnUpdateRequestCacheAsync (BeginEventHandler 
bh , EndEventHandler 
eh );
public void 
CompleteRequest ( );
public virtual void 
Dispose ( );                   // implements IDisposable
public virtual string 
GetVaryByCustomString (HttpContext 
context , string 
custom );
public virtual void 
Init ( );
// Events
public event EventHandler 
AcquireRequestState ;
public event EventHandler 
AuthenticateRequest ;
public event EventHandler 
AuthorizeRequest ;
public event EventHandler 
BeginRequest ;
public event EventHandler 
Disposed ;              // implements System.ComponentModel.IComponent
public event EventHandler 
EndRequest ;
public event EventHandler 
Error ;
public event EventHandler 
PostRequestHandlerExecute ;
public event EventHandler 
PreRequestHandlerExecute ;
public event EventHandler 
PreSendRequestContent ;
public event EventHandler 
PreSendRequestHeaders ;
public event EventHandler 
ReleaseRequestState ;
public event EventHandler 
ResolveRequestCache ;
public event EventHandler 
UpdateRequestCache ;
}

Returned By

HttpContext.ApplicationInstance

Passed To

HttpContext.ApplicationInstance, IHttpModule.Init( ), System.Web.Security.DefaultAuthenticationModule.Init( ), System.Web.Security.FileAuthorizationModule.Init( ), System.Web.Security.FormsAuthenticationModule.Init( ), System.Web.Security.PassportAuthenticationModule.Init( ), System.Web.Security.UrlAuthorizationModule.Init( ), System.Web.Security.WindowsAuthenticationModule.Init( ), System.Web.SessionState.SessionStateModule.Init( )