Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

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

Posted on 2004-03-27
4
Medium Priority
?
820 Views
Last Modified: 2007-12-19
Hi all

this is driving me slightly mad. I'm integrating two different apps, with their own authentication methods (seemed like a good idea at the time!).  It builds fine.

Making this call (userInt is set to a valid integer in both cases) in global.asax:

InstantASP.InstantForum.Logic.UserExists(userInt);

in Session_Start is working ok, but in Application_AuthenticateRequest it gives me the following error:

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

Stack Trace:
NullReferenceException: Object reference not set to an instance of an object.]
   InstantASP.InstantForum.Logic.ReturnSessionID() +15
   InstantASP.InstantForum.Logic.UserExists(Int32 UserID) +202
   CEL.Global.Application_AuthenticateRequest(Object sender, EventArgs e) in c:\inetpub\wwwroot\cel\global.asax.cs:129
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


Any pointers as to how to track down?  The object I'm calling is a compiled dll, so getting in to what it's doing is going to be tricky.  I'm wondering if there's a different context for these two parts of global.asax, but to be honest am a bit lost.

Thanks in advance
Ben
0
Comment
Question by:bjohns33
  • 2
  • 2
4 Comments
 
LVL 2

Accepted Solution

by:
codewiz51 earned 2000 total points
ID: 10695301
If you notice, the failure occurs when the class attempts to return the sessionID:
InstantASP.InstantForum.Logic.ReturnSessionID() +15

That's because you don't have a session established at the time Application_AuthenticateRequest excutes, but it does exist by the time Session_Start executes.

This is based on wild conjecture at this point, but I am betting the original authors intended for UserExists to be excuted after a session is established.

Good luck on this.
0
 
LVL 1

Author Comment

by:bjohns33
ID: 10695464
Thanks for the response - despite your 'wild conjecture', I'm sure you're right!

So, is a solution to move all of my authentication code in to Application_OnPostRequestHandlerExecute instead, as this does have access to the session?

What will this break?

Cheers
Ben
0
 
LVL 1

Author Comment

by:bjohns33
ID: 10695806
Hi CodeWiz

Have moved it all to the Application_OnPostRequestHandlerExecute, and miracle of miracles, it works.

Thanks for pointing me in the right direction.

Cheers
Ben
0
 
LVL 2

Expert Comment

by:codewiz51
ID: 10696407
Sorry, I was cutting the grass and didn't see your responses.  Amazing, I have a life occasionally!  I'm glad moving the code worked, because I didn't have a clue as to whether anything would break if you moved it to Application_OnPostRequestHandlerExecute.  ;-)

0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article describes a simple method to resize a control at runtime.  It includes ready-to-use source code and a complete sample demonstration application.  We'll also talk about C# Extension Methods. Introduction In one of my applications…
Summary: Persistence is the capability of an application to store the state of objects and recover it when necessary. This article compares the two common types of serialization in aspects of data access, readability, and runtime cost. A ready-to…
Integration Management Part 2
Kernel Data Recovery is a renowned Data Recovery solution provider which offers wide range of softwares for both enterprise and home users with its cost-effective solutions. Let's have a quick overview of the journey and data recovery tools range he…
Suggested Courses

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question