w3schools    w3Schools
Search W3Schools :
HOME HTML CSS XML JAVASCRIPT ASP PHP SQL MORE...   References Examples Forum About

XML Certification
Download XML editor
Custom Programming
Table of contents
ASP Tutorial
ASP Introduction
ASP Install
ASP Syntax
ASP Variables
ASP Procedures
ASP Forms
ASP Cookies
ASP Session
ASP Application
ASP #include
ASP Global.asa
ASP Send e-mail

ASP Objects
ASP Response
ASP Request
ASP Application
ASP Session
ASP Server
ASP Error

ASP FileSystem
ASP TextStream
ASP Drive
ASP File
ASP Folder
ASP Dictionary

ASP Components
ASP AdRotator
ASP BrowserCap
ASP Content Linking
ASP Content Rotator

ASP Quick Ref
ASP Summary

ASP Examples
ASP Quiz
ASP Exam

Selected Reading
Web Statistics
Web Glossary
Web Hosting
Web Quality

W3Schools Tutorials
W3Schools Forum

Helping W3Schools


ASP Session Object

previous next

The Session object is used to store information about, or change settings for a user session. Variables stored in the Session object hold information about one single user, and are available to all pages in one application.

The Session object

When you are working with an application, you open it, do some changes and then you close it. This is much like a Session. The computer knows who you are. It knows when you start the application and when you end. But on the internet there is one problem: the web server does not know who you are and what you do because the HTTP address doesn't maintain state.

ASP solves this problem by creating a unique cookie for each user. The cookie is sent to the client and it contains information that identifies the user. This interface is called the Session object.

The Session object is used to store information about, or change settings for a user session. Variables stored in the Session object hold information about one single user, and are available to all pages in one application. Common information stored in session variables are name, id, and preferences. The server creates a new Session object for each new user, and destroys the Session object when the session expires.

When does a Session Start?

A session starts when:

  • A new user requests an ASP file, and the Global.asa file includes a Session_OnStart procedure
  • A value is stored in a Session variable
  • A user requests an ASP file, and the Global.asa file uses the <object> tag to instantiate an object with session scope

When does a Session End?

A session ends if a user has not requested or refreshed a page in the application for a specified period. By default, this is 20 minutes.

If you want to set a timeout interval that is shorter or longer than the default, you can set the Timeout property.

The example below sets a timeout interval of 5 minutes:


To end a session immediately, you may use the Abandon method:


Note: The main problem with sessions is WHEN they should end. We do not know if the user's last request was the final one or not. So we do not know how long we should keep the session "alive". Waiting too long for an idle session uses up resources on the server, but if the session is deleted too soon the user has to start all over again because the server has deleted all the information. Finding the right timeout interval can be difficult!

Tip: If you are using session variables, store SMALL amounts of data in them.

Store and Retrieve Session Variables

The most important thing about the Session object is that you can store variables in it.

The example below will set the Session variable username to "Donald Duck" and the Session variable age to "50":

Session("username")="Donald Duck"

When the value is stored in a session variable it can be reached from ANY page in the ASP application:

Welcome <%Response.Write(Session("username"))%>

The line above returns: "Welcome Donald Duck".

You can also store user preferences in the Session object, and then access that preference to choose what page to return to the user. 

The example below specifies a text-only version of the page if the user has a low screen resolution:

<%If Session("screenres")="low" Then%> 
  This is the text version of the page
  This is the multimedia version of the page
<%End If%>

Remove Session Variables

The Contents collection contains all session variables.

It is possible to remove a session variable with the Remove method.

The example below removes the session variable "sale" if the value of the session variable "age" is lower than 18:

If Session.Contents("age")<18 then 
End If 

To remove all variables in a session, use the RemoveAll method:


Loop Through the Contents Collection

The Contents collection contains all session variables. You can loop through the Contents collection, to see what's stored in it:

Session("username")="Donald Duck"
dim i
For Each i in Session.Contents
  Response.Write(i & "<br />")



If you do not know the number of items in the Contents collection, you can use the Count property:

dim i
dim j
Response.Write("Session variables: " & j)
For i=1 to j
  Response.Write(Session.Contents(i) & "<br />")


Session variables: 2
Donald Duck

Loop Through the StaticObjects Collection

You can loop through the StaticObjects collection, to see the values of all objects stored in the Session object:

dim i
For Each i in Session.StaticObjects
  Response.Write(i & "<br />")

previous next

Altova® MissionKit® - Integrated suite of XML tools

The Altova MissionKit is a suite of intelligent XML tools, including:

XMLSpy® – industry-leading XML editor

  • Support for all XML-based technologies
  • Graphical editing views, powerful debuggers, code generation, & more

MapForce® – graphical data mapping tool

  • Drag-and-drop data conversion with code generation
  • Support for XML, DBs, EDI, Excel® 2007, text, Web services

StyleVision® – visual stylesheet designer

  • Drag-and-drop stylesheet design for XML & databases
  • Output to HTML, PDF, RTF, Word 2007, & more

And more…

Try before you buy with a free fully functional 30-day trial

Download today

ASP.NET Web Hosting
Web Hosting
$15 Domain Name
Save $20 / year!
Buy UK Domain Names
Register Domain Names
Cheap Domain Names
Cheap Web Hosting
Best Web Hosting
PHP MySQL Hosting
Top 10 Web Hosting
UK Reseller Hosting
Web Hosting
FREE Web Hosting
Website Templates
Flash Templates
Website Builder
Internet Business Opportunity
Custom Programming
FREE Trial or Demo
Web Content Manager
Forms,Web Alerts,RSS
Download XML editor
FREE Flash Website
FREE Web Templates
US Web Design Schools
HTML Certification
JavaScript Certification
XML Certification
PHP Certification
ASP Certification

Home HOME or Top of Page Validate   Validate   W3C-WAI level A conformance icon Printer Friendly  Printer Friendly

W3Schools is for training only. We do not warrant the correctness of its content. The risk from using it lies entirely with the user.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2009 by Refsnes Data. All Rights Reserved.