My Session variable is always null

Question

I'm creating a movie ticket reservation project. I want to get username from page1 and display it on page2 (using session variable)

Page1:

 string uname = TextBox1.Text;
 Session["UName"] = uname;
 Session.Timeout = 30;

Page2:

 if ((string)Session["UName"] != null)
        {
            string user = (string)Session["UName"];
        }

and I placed a sign out button in page2 to remove session variable value. But the session variable is always null. I've already used cookies in the page1 and will this be a cause? or what else? Please Help. Thanks in advance.

And does TextBox1.Text actually have a value? Please past in more code.... — Mad Dog Tannen, Oct 03 '13 at 14:14
Are you prematurely removing the `Session` on page 2? Check that whatever function you are using to clear the session is not accidentally triggered. — Kami, Oct 03 '13 at 14:15
I'm using master pages and I want to load the TextBox1 value to session variable at the time of submitbutton_click(). — user2842987, Oct 03 '13 at 14:16
Is there any other ways to store and retrieve username other than session variable? — user2842987, Oct 03 '13 at 14:31
@user2842987 which event of which page do you set it in and which event of which page do you read it in? — Yuriy Galanter, Oct 03 '13 at 14:33
I'm setting the session var value in ButtonClick event of Page1 (Submit Button) and retrieving it on the PageLoad event of Page2(To display UserName in Label Control) — user2842987, Oct 03 '13 at 14:36
@user2842987 of course you can use `querystring` but it depends upon the scope of your requirement. — Suraj Singh, Oct 03 '13 at 14:40
@SurajSingh, You should **never** put a username in a querystring! — Liam, Oct 03 '13 at 14:42
I wouldn't pass anything remotely related to security in a query string. @user2842987 how do you get from Page1 to Page2? — Yuriy Galanter, Oct 03 '13 at 14:43
@Liam I agree ! I just tried to give him a option he has, to pass data. — Suraj Singh, Oct 03 '13 at 14:51
Could you please tell me any other ideas other than query string because currently I'm using query string. — user2842987, Oct 03 '13 at 17:47

score 1 · Answer 1 · edited May 23 '17 at 12:24

1

See this answer on when the Session can be null:

What should I do if the current ASP.NET session is null?

I personally often ran into this issue when I was using async requests with completion callback. In these callbacks I wanted to set something in the session and it was null.

edited May 23 '17 at 12:24

Community

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answered Oct 03 '13 at 14:21

Robert

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James Johnson · Answer 2 · 2013-10-03T15:04:02.927

This usually occurs when doing a Response.Redirect after setting the session variable. You can work around this issue by calling the overload instead:

Response.Redirect("...", false); // false = don't stop execution

//causes ASP.NET to bypass all events and filtering in the HTTP pipeline
//chain of execution and directly execute the EndRequest event
HttpContext.Current.ApplicationInstance.CompleteRequest();

The underlying issue is a ThreadAbortException which is often ignored because it doesn't break the application. This is a known issue, and you can learn more about it here: http://support.microsoft.com/kb/312629.

Side Note

On a side note, you shouldn't be resetting your Session.Timeout value in the code like that. I can't be sure, but that may also have an adverse affect on your logic. Instead, you should specify the session timeout in the web.config under the system.web section:

<sessionState timeout="60"  />

I tried it already but it's not working. I'm struggling with this issue for a long time. — user2842987, Oct 03 '13 at 14:42

score 0 · Answer 3 · edited May 21 '18 at 23:04

0

I also had same problem, I was toggling between debugging two different sites on localhost and there were two cookies for the session ID.

I deleted the cookies via Chrome's developer tools [Press F12 in Browser]->Application->Storage->Cookies

edited May 21 '18 at 23:04

E. Moffat

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answered May 21 '18 at 21:42

user3582680

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My Session variable is always null

3 Answers3