if (HttpContext.Current.Session["id"] != null) is returning NULL EXCEPTION

Question

I have a mvc project.

problem 1 )

When i start my project in the my visual studio, session_end (in global.asax) starts. is that normal ? i dont open session and close session at the beginning of the project but it works.

problem 2)

The method i have written in my class works when session_end fires. i set it like this. but when i starts my project, session_end fires. anyway, this is not a big problem for me,,,,

BUT

my method has

if (HttpContext.Current.Session["id"] != null)

this line. when this line works, the error occurs

NULL REFERENCE EXCEPTION

An exception of type 'System.NullReferenceException' occurred in blabla.dll but was not handled in user code Additional information: Object reference not set to an instance of an object.

how can I fix this?

score 0 · Accepted Answer · answered Feb 01 '17 at 12:49

0

It's because your HttpContext or Current is null. if you using c#6 you can do this:

if (HttpContext?.Current?.Session["id"] != null)

or you can check for null separately.

answered Feb 01 '17 at 12:49

SᴇM

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i am not using c# 6 for now. i used null control for all. it work thanks. do you have any idea that session_end fires when i start the project ? – canmustu Feb 01 '17 at 12:53
What's your .Net version? – SᴇM Feb 01 '17 at 12:58
i use .net framework 4.5 – canmustu Feb 01 '17 at 13:00
Your project is MVC or WebForm? – SᴇM Feb 01 '17 at 13:01
mvc project,,,, – canmustu Feb 01 '17 at 13:03
I was never faced that problem before, so please check [this](https://www.codeproject.com/Articles/246649/ASP-NET-Session-End-event-fires-immediately-after) post, maybe it will help you. – SᴇM Feb 01 '17 at 13:04
okay, thank you so much. i will check it. – canmustu Feb 01 '17 at 13:05

if (HttpContext.Current.Session["id"] != null) is returning NULL EXCEPTION

problem 1 )

problem 2)

1 Answers1