When you think ASP, think...
Recent Articles xml
All Articles
ASP.NET Articles
Related Web Technologies
User Tips!
Coding Tips
spgif spgif

Sample Chapters
JavaScript Tutorials
MSDN Communities Hub
Official Docs
Stump the SQL Guru!
XML Info
Author an Article
spgif spgif
ASP ASP.NET ASP FAQs Feedback topnav-right

The 4 Guys Present: ASPFAQs.com

Jump to a FAQ
Enter FAQ #:
..or see our 10 Most Viewed FAQs.

4GuysFromRolla.com : ASP FAQS : Session Object


For session variables to work, must the Web visitor have cookies enabled?

[Print this FAQ]

Answer: Kind of. Session variables are bits of information that can be stored on a user-by-user basis. These bits of information are stored on the Web server. To tie these bits of memory with a particular user, for session variables to persist across Web pages, the user must have cookies enabled. When a user first visits a page on a site that uses Session variables, two things happen:

-- A block of memory is allocated for that particular user's session variables on the Web server. This block of memory is identified by a unique SessionID
-- A cookie is written to the user's computer, storing the value of the SessionID

When the user visits another page on the site that uses session variables, the users SessionID cookie is referenced to determine if the user already has a session variable memory block setup. If he does, the values that are stored there are referenced. Through this mechanism, one can create seemingly "global" variables that persist from one page to another.

But what if the user doesn't have cookies enabled? Session variables can still be used, but there will be no way for the user to store the SessionID as he jumps from page to page. Hence, the session variables will not be saved for the user who has cookies disabled. However, session variables that are created and referenced on the same page will work fine. For example, the following script will output "Hello, World" regardless of whether or not the user has cookies enabled:

  Session("Message") = "Hello, World!"
  Response.Write Session("Message")

Of course, if, on another page, the value of Session("Message") is referenced, only those users who have cookies enabled will have a value of "Hello, World!" there.

For more information on Session variables (and info on maintaining state, in general, on the Web), be sure to read the sample chapter from my book,
Sams Teach Yourself Active Server Pages 3.0 in 21 Days!

FAQ posted by Scott Mitchell at 9/26/2000 11:13:06 PM to the Session Object category. This FAQ has been viewed 133,635 times.

Do you have a FAQ you'd like to suggest? Suggestions? Comments? If so, send it in! Also, if you'd like to be a FAQ Admin (creating/editing FAQs), let me know! If you are looking for other FAQs, be sure to check out the 4Guys FAQ and Commonly Asked Messageboard Questions!

Most Viewed FAQs:

1.) How can I format numbers and date/times using ASP.NET? For example, I want to format a number as a currency. (761643 views)
2.) I am using Access and getting a 80004005 error (or a [Microsoft][ODBC Microsoft Access Driver] The Microsoft Jet database engine cannot open the file '(unknown)' error) when trying to open a connection! How can I fix this problem? (207777 views)
3.) How can I convert a Recordset into an array? Also, how can I convert an array into a Recordset? (202549 views)
4.) How can I quickly sort a VBScript array? (196039 views)
5.) How can I find out if a record already exists in a database? If it doesn't, I want to add it. (156019 views)
6.) How do I display data on a web page using arrays instead of Do...While...MoveNext...???... (152331 views)
7.) When I get a list of all files in a directory via the FileSystemObject, they aren't ordered in any reasonable way. How can I sort the files by name? Or by size? Or by date created? Or... (140381 views)
8.) For session variables to work, must the Web visitor have cookies enabled? (110162 views)
9.) Can I send emails without using CDONTS? (107083 views)
10.) How can I take the result of a SELECT...MULTIPLE or a group of same-named checkboxes and turn it into a query? That is, if the user selects 3 answers, how can I construct a query that looks for all 3? (106308 views)
Last computed at 9/17/2007 3:22:00 AM

ASP.NET [1.x] [2.0] | ASPFAQs.com | Advertise | Feedback | Author an Article