Session variable lost in redirect

I am having a problem with loosing a session variable after I redirect to another page. Here is my code:


if(sAuthorized != "-1" && sAuthorized != "-2")


Session["user"] = sAuthorized;



private void Page_Load(object sender, System.EventArgs e)



   string sUserID = Session["user"].ToString();

   DataSet ds = SqlHelper.ExecuteDataset(DataAccessLayer.ULTConn(), "sp_get_users_courses",

   new SqlParameter("@user", SqlDbType.VarChar, 20).Value = sUserID);

   dgCourses.DataSource = ds;



private void CheckLogin()


   if(Session["user"] == null)





This works on my Windows XP Pro SP2 laptop without any problems, but when I upload it to my Windows 2003 Server I get the following error when it redirects to the index .aspx page:


Server Error in '/ULTOnlineTraining' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   ULTOnlineTraining.WebForm1.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\ultonlinetraining\index.aspx.cs:29
   System.Web.UI.Control.OnLoad(EventArgs e) +67
   System.Web.UI.Control.LoadRecursive() +35
   System.Web.UI.Page.ProcessRequestMain() +750

Version Information: Microsoft .NET Framework Version:1.1.4322.2300; ASP.NET Version:1.1.4322.2300

Any help would greatly be appreciated.

7/22/2005 7:26:06 PM 8807 articles. 0 followers. Follow

6 Replies

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What is line 29 of your code?
7/26/2005 8:20:23 PM
This is line 29:

string sUserID = Session["user"].ToString();

Thanks for the help.
7/26/2005 8:26:41 PM
There doesnt seem to be anything wrong with that line of code. Do you have cookies enabled on your machine? Or have your session management set to be cookieless?

7/26/2005 8:36:18 PM
That was it. I changed it to cookieless="true". Are there any drawbacks to using this method?
7/26/2005 8:43:06 PM
Its easier to be spoofed. If I get your session ID, the information between (), I can be automatically logged in as you. Its an unlikely event, but it is possible. Its also less performant than using cookies. Hope this helps

7/26/2005 9:29:08 PM
Thanks for the help.
7/26/2005 9:42:47 PM

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