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session object asp.net/vb.net

Posted on 2008-10-09
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What is session object and how it is used. in asp.net /vb.net to display the result on the third page.
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Question by:mahmood_786
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10 Comments
 
LVL 8

Expert Comment

by:rodmjay
ID: 22680903
you can add something to the session like this

Page.Session.Add("key", value)

or normally you just do

Session("key") = value

and then to get the value back on another page you can just do

CType(MyObjectType, Session("key"))

professionals usually do something like htis

dim x as object = Session("key")
if x isnot nothing
 ' cast to your type
  CType(MyObjectType, Session("key"))
end if
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Author Comment

by:mahmood_786
ID: 22683411
what is key and what is value in here i do not understand
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LVL 5

Expert Comment

by:harwantgrewal
ID: 22683626
Hi mahood_786
Before I explain anyting on that I wanted to know you .NET level or in general programming level. As it will help me in explaing you in that way.

Thanks
Harry
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Assisted Solution

by:mrleowashingtonII
mrleowashingtonII earned 800 total points
ID: 22688620
The Key value is a variable that you assign. For example

Session("User")=login1.username.value
You can now call that session variable from within your ASP.Net pages by using the

myvariable=CType(Session("user"), String)

You can then do whatever you need to do based on the user for that pparticular web page.
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Expert Comment

by:mrleowashingtonII
ID: 22689631
If you need further clarification:

The first Line  in my comment would go into a login page for example. Now, the values is stored as a session key, (Like a variable that exist for the length of the session).

When the user moves from page to page, you must put in the second line (or something similar, ie open a data set based on the value in the session, or display certain values in a listbox.

You can assign the value to nearly anything, as long as you use it in the format shown behind the equal sign.
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LVL 5

Expert Comment

by:harwantgrewal
ID: 22691348
Hi mahmood_786

I let try to explain Sessions in details then you can view code for rodmjay which will help you to use session in VB.NET.

In Any programming you have to use variables now each variable has a scope, which means what is the boundaries of each variable. You have private, public, Global. And each type name make sense. Now Session is a container of different variable which are kind of Global, when I say kind of means its available to every page in your application in the same browser. Another type of Container for global variable is Application which are available to you application irrespective of browser.

Now when I mentioned Session are like container which holds all the session variables not if you want to get any kind of variable out of this container then you need some key attached to every variable. Its like you have so many doors and you need key attached to each door to open and get the value :) so when you want to get the variable value you provide key to session variable and it will get or set value to that key.
Example
To Set Value
Session("hiword") = "Hello"
To Get Value
Dim hi as String
hi = Session("hiword");

I hope that will make you understand what are sessions
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Author Comment

by:mahmood_786
ID: 22698557
harwant that was great explaination,so the above code will give the value of hello where ever it is called on the application pages?
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LVL 5

Expert Comment

by:harwantgrewal
ID: 22698638
yes that's true you will get hello as results on every page provided it's been requested by the same browser
Harry
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LVL 5

Accepted Solution

by:
harwantgrewal earned 1200 total points
ID: 22698987
Just a bit more on Sessions.
Basicly the sessions are stored on the server memory and when you open a browser a session ID is generated by browser whenever you try to create a session variable and then browser sends this session ID on each request made by the browser. And server session technology is so smart that get get the session container for your browser with that ID. And basically this session ID is stored as a cookie in the browser and if you disable the cookies you have to sepcify in your application that you want the application sessions to be cookie less, then you application automatically convertes all the URL to attach session ID in the string, and thats how you can get your session object.

Harry
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