System.Web Namespace

Defines the methods, properties, and events common to all application objects within an ASP.NET application. This class is the base class for applications defined by the user in the global.asax file.

Instances of this class are created in the ASP.NET infrastructure, not by the user directly. One instance is used to process many requests in its lifetime but it can process only one at a time. Thus member variables can be used to store per-request data.

An application executes events that are handled by modules or user code defined in the global.asax file in the following sequence:

1. BeginRequest
2. AuthenticateRequest
3. AuthorizeRequest
4. ResolveRequestCache
   • A handler ( a page corresponding to the request URL is created at this point. ]
5. AcquireRequestState
6. PreRequestHandlerExecute
   • The handler is executed.
7. PostRequestHandlerExecute
8. ReleaseRequestState
   • Response filters, if any, filter the output.
9. UpdateRequestCache
10. EndRequest

HttpApplication.propertyName = value;
HttpApplication.methodName ( arguments );

HttpApplication.propertyName = value
HttpApplication.methodName ( arguments )

Type var = HttpApplication.propertyName;
Type var = HttpApplication.collectionName  [ key ];
Type var = HttpApplication.methodName ( arguments );

Dim var as Type = HttpApplication.propertyName
Dim var as Type = HttpApplication.collectionName ( key ) 
Dim var as Type = HttpApplication.methodName ( arguments )

HttpApplicationState Class