December 2001
Beginner
464 pages
13h 51m
English
Content preview from Programming Visual Basic .NETBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Maintaining State
The process of serving web pages is inherently stateless. By default, each request to a web server is isolated from every other request that a user might make. This is a fine model for serving static web pages, but it’s not very useful for full-featured applications. To be useful, applications must keep track of state. This section describes the different options that web developers have for storing state.
The Session Object
When a user browses to a web page served by IIS, IIS considers it the start of a session for that user. A session is an abstract concept that refers to the period of time within which a particular user is interacting with a web application. Although it’s easy to determine when a session starts, it’s not so easy to know when that session ends. This is because of the inherent disconnectedness of web browsing. After any given web request is serviced, IIS doesn’t really know whether the user will issue more requests (browse to more pages). For this reason, IIS establishes a session timeout period. If no new requests are received from a user after a given amount of time, IIS considers that session to have ended.
A session corresponds to a single use of a web application by a single user. To assist the web application in maintaining state for the duration of a session, ASP.NET provides an intrinsic object called the Session object. When a session begins, ASP.NET instantiates a Session object. During processing of web requests, the application can ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.