June 2002
Intermediate to advanced
816 pages
28h 12m
English
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Chapter 13. The HttpApplicationState Class
Developers who are new to Web-based development encounter several challenges. Among the most serious is the realization that rather than a single monolithic application, web-based applications are just a series of pages. A web server is like an unusually inattentive waiter. Imagine sitting down for dinner and placing your order for drinks. When you next see the waiter, he asks you again what you would like to drink, as if he has never seen you before. Each request to the web browser is seen as a completely new request, totally unrelated to any previous request.
Several problems with the way Web-based applications are structured need to be resolved:
Session data (data specific to a single user across all pages) needs to be available. While it is always a good idea to minimize session state, it is generally not possible to completely eliminate session state.
Global data (data required across all pages and to all users) needs to be exposed. Traditional rich-client applications use global variables to store needed data application-wide. Classes instantiated on one page are not available to other pages, so creating global classes is not a solution.
Session data in ASP.NET can be managed in the
HttpSessionState
class, which will be covered in Chapter 19. Global data can be stored in the
HttpApplicationState class, which is covered in
this chapter.
ASP.NET creates the illusion that pages are grouped into an application. An instance of the
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.