Asp.net Session assign value by ref or by val

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i need to ask question
is session work by val or by ref
mean if i said
iam working on web site and use linq to sql dbml
i have stored procedure in dbml
for example say my stored procedure called sp
in my c# Code
1- say sesssion["a"]=list<sp>
2- list<sp>.add new row
3- when i look again on my session i find it's value increase
instead of i didn't assign it it again after add the new row

Posted 21-Aug-11 21:25pm

md_refay

Updated 21-Aug-11 21:32pm

v2

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sreeparnamaz 5-Sep-12 3:15am

In my case i am assigning the session in a list. When the list get updated the session also get updated.
List<string> _lstResult = new List<string>();
_lstResult = (List<string>)Session["Result"];
after this any change in the list the change get reflected in the session.
We do not want the session to get updated when the list is modified.How to resolve this issue??

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Abhinav S · Answer 1 · 2011-08-21T21:33:00

Solution 1

Why don't you simply try it out?

A session stores items as a SessionStateItemCollection.
This, in turn, is a collection of objects.

So I would think items in a session will be reference type.

Posted 21-Aug-11 21:33pm

Abhinav S

Comments

[no name] 22-Aug-11 3:38am

can i have any way to convert it to value type

Abhinav S 22-Aug-11 3:46am

You can always use the Convert method in your code to do conversions from object to int etc.

Simon Bang Terkildsen · Answer 2 · 2011-08-21T21:36:00

Solution 2

session["a"] will be 1.

As for your updated (second) question, the list in sesssion["a"] will be the same list you added a row to.

Refer to
Value Types (C# Reference)[^]
Reference Types (C# Reference)[^]

If you don't want the list in your session to get the row you add you can do

C#

Session["a"] = new List<...>(list);

Posted 21-Aug-11 21:36pm

Simon Bang Terkildsen

Updated 21-Aug-11 21:42pm

v5

Comments

[no name] 22-Aug-11 3:39am

i edit my question to be more reality could u look at it again

Keith Barrow · Answer 3 · 2011-08-21T21:38:00

Solution 3

It is simple enough to try out, if you put this into the page load method:

int x =2;
Session["a"] = x;
x = 3;
var y = Session["a"];

y ends up with the value 2, making items in the Session reference types.

Posted 21-Aug-11 21:38pm

Keith Barrow

Comments

[no name] 22-Aug-11 3:41am

i edit my question to be more reality could u look at it again
becuase the value i assign to session is refernce value