Clear session variable value

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I want to clear session varibale value in logout event. but it won't works.
code is here

if (Page.IsPostBack == false)
            {
                string s = Session["loginid"].ToString();

                if (Session["loginid";].ToString() == "")
                {
                    Response.Redirect("errorpage1.aspx");
                }
            }

Posted 12-May-11 23:50pm

singh7pankaj

Updated 12-May-11 23:53pm

walterhevedeich

v2

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Ankur^\m/ · Answer 1 · 2011-05-13T00:25:00

Solution 2

Usually we use Session.Abondon() method to destroy all objects stored in session object if a user logs out.
If you need to clear only a particular session object, set it to null.

C#

Session["loginid"] = null;

And do a null check wherever you need to check if it has any value or not.

C#

if (Session["loginid"] == null)
{
    //redirect
}
else
{
    //user is logged in
}

Session["loginid"] = ""; still refers to a memory location, but if you assign the session object a null value, it will no more refer to any memory location, which in your case makes more sense.

BTW I also notice a syntax error in your code, if (Session["loginid";].ToString() == "")
The semi colon shouldn't be there.

Hope this helps!

Posted 13-May-11 0:25am

Ankur^\m/

Comments

raju melveetilpurayil 13-May-11 6:26am

Good one :P my 5

singh7pankaj 13-May-11 6:47am

It won't works.
I corrected it all but also its not done

Ankur^\m/ 13-May-11 6:52am

Did you try what I said? Moreover why the code is inside "Page.IsPostBack == false". Remove that as well.

singh7pankaj 13-May-11 6:58am

Yes i remove all that but also it won't work

Ankur^\m/ 13-May-11 7:09am

Did you assign Session["loginid"] = null; after the user logs out?

singh7pankaj 13-May-11 7:00am

Its not working after removing that also

Ankur^\m/ 13-May-11 7:45am

Is it working now?

singh7pankaj 13-May-11 23:14pm

No its not working after giving that also

Ashishmau · Answer 2 · 2011-05-12T23:52:00

Solution 1

u can do like

C++

Session["loginid"]="";

Posted 12-May-11 23:52pm

Ashishmau

Comments

singh7pankaj 13-May-11 6:49am

It won't works.I did that also.

Nick Reshetinsky 13-May-11 7:30am

Session["loginid"] = null;
it's right cause if you assign "" (empty string) it would still reference some memory block