Session Variable in Application_Err or

[bmukulu]

Hi,

I am trying to add some error handling in a Global.asax file. I am
declaring a session variable within the Application_Err or procedure.
However, everytime i try to pass something into the sessionstate i get
a error message of 'Object reference not set to an instance of an
object.' Is there any workaround for this? And why am I getting this
error?

Thanks in advance

[Juan T. Llibre]

Post the code which is failing.

Juan T. Llibre, asp.net MVP
asp.net faq : http://asp.net.do/faq/
foros de asp.net, en español : http://asp.net.do/foros/
=============== =============== =====
<bm*****@gmail. comwrote in message news:11******** **************@ y66g2000hsf.goo glegroups.com.. .

Hi,

I am trying to add some error handling in a Global.asax file. I am
declaring a session variable within the Application_Err or procedure.
However, everytime i try to pass something into the sessionstate i get
a error message of 'Object reference not set to an instance of an
object.' Is there any workaround for this? And why am I getting this
error?

Thanks in advance

[bmukulu]

On Mar 25, 1:24 pm, "Juan T. Llibre" <nomailrepl...@ nowhere.com>
wrote:

Post the code which is failing.

Juan T. Llibre, asp.net MVP
asp.net faq :http://asp.net.do/faq/
foros de asp.net, en español :http://asp.net.do/foros/
=============== =============== =====

<bmuk...@gmail. comwrote in messagenews:11* *************** ******@y66g2000 hsf.googlegroup s.com...

Hi,

I am trying to add some error handling in a Global.asax file. I am
declaring a session variable within the Application_Err or procedure.
However, everytime i try to pass something into the sessionstate i get
a error message of 'Object reference not set to an instance of an
object.' Is there any workaround for this? And why am I getting this
error?

Thanks in advance- Hide quoted text -

- Show quoted text -

Here is the code:
Sub Application_Err or(ByVal sender As Object, ByVal e As
EventArgs)
' Fires when an error occurs
Dim ex As Exception = Server.GetLastE rror()
If Not ex.InnerExcepti on Is Nothing AndAlso TypeOf
ex.InnerExcepti on Is System.IO.FileN otFoundExceptio n Then
HttpContext.Cur rent.Session("s Example") = "This is an
example"

End If

End Sub

[=?ISO-8859-1?Q?G=F6ran_Andersson?=]

bm*****@gmail.c om wrote:

On Mar 25, 1:24 pm, "Juan T. Llibre" <nomailrepl...@ nowhere.com>
wrote:

>Post the code which is failing.

Juan T. Llibre, asp.net MVP
asp.net faq :http://asp.net.do/faq/
foros de asp.net, en español :http://asp.net.do/foros/
============== =============== ======

<bmuk...@gmail .comwrote in messagenews:11* *************** ******@y66g2000 hsf.googlegroup s.com...

>>Hi,
I am trying to add some error handling in a Global.asax file. I am
declaring a session variable within the Application_Err or procedure.
However, everytime i try to pass something into the sessionstate i get
a error message of 'Object reference not set to an instance of an
object.' Is there any workaround for this? And why am I getting this
error?
Thanks in advance- Hide quoted text -

- Show quoted text -

Here is the code:
Sub Application_Err or(ByVal sender As Object, ByVal e As
EventArgs)
' Fires when an error occurs
Dim ex As Exception = Server.GetLastE rror()
If Not ex.InnerExcepti on Is Nothing AndAlso TypeOf
ex.InnerExcepti on Is System.IO.FileN otFoundExceptio n Then
HttpContext.Cur rent.Session("s Example") = "This is an
example"

End If

End Sub

You have to check if you have an HttpContext object before you try to
use it. It's not at all certain that the code where the error occurs has
a http context at all.

--
Göran Andersson
_____
http://www.guffa.com

[Juan T. Llibre]

Can you try this and see if it makes a difference ?

Protected Sub Application_Err or(sender As [Object], e As EventArgs)

' Get the information about the error
Dim ctxt As HttpContext = HttpContext.Cur rent

Dim except As Exception = ctxt.Server.Get LastError()

Dim errorInfo As String = "<br>Offend ing URL: " + ctxt.Request.Ur l.ToString() + "<br>Source : " _
+ except.Source + "<br>Messag e: " + except.Message + "<br>Stack trace: " + except.StackTra ce

ctxt.Response.W rite(errorInfo)

' --------------------------------------------------
' To let the page finish executing we clear the error
' --------------------------------------------------
ctxt.Server.Cle arError()
End Sub

--------

Next suggestion :

Without a valid session, you won't be able to store the exception information in it.

Try wrapping the statement in a conditional :

If Not HttpContext.Cur rent.Session Is Nothing Then
Dim ctxt As HttpContext = HttpContext.Cur rent
Dim except As Exception = ctxt.Server.Get LastError()
HttpContext.Cur rent.Session.Ad d("sExample", except)
End If

That will tell you if your Session is valid.

If it is valid, you'll see the Session sExample set with the Exception info.
If it's not valid, Session sExample will be empty.

Juan T. Llibre, asp.net MVP
asp.net faq : http://asp.net.do/faq/
foros de asp.net, en español : http://asp.net.do/foros/
=============== =============== =====
<bm*****@gmail. comwrote in message news:11******** **************@ n59g2000hsh.goo glegroups.com.. .
On Mar 25, 1:24 pm, "Juan T. Llibre" <nomailrepl...@ nowhere.com>
wrote:

Post the code which is failing.

Juan T. Llibre, asp.net MVP
asp.net faq :http://asp.net.do/faq/
foros de asp.net, en español :http://asp.net.do/foros/
=============== =============== =====

<bmuk...@gmail. comwrote in messagenews:11* *************** ******@y66g2000 hsf.googlegroup s.com...

Hi,

I am trying to add some error handling in a Global.asax file. I am
declaring a session variable within the Application_Err or procedure.
However, everytime i try to pass something into the sessionstate i get
a error message of 'Object reference not set to an instance of an
object.' Is there any workaround for this? And why am I getting this
error?

Thanks in advance- Hide quoted text -

- Show quoted text -

Here is the code:
Sub Application_Err or(ByVal sender As Object, ByVal e As
EventArgs)
' Fires when an error occurs
Dim ex As Exception = Server.GetLastE rror()
If Not ex.InnerExcepti on Is Nothing AndAlso TypeOf
ex.InnerExcepti on Is System.IO.FileN otFoundExceptio n Then
HttpContext.Cur rent.Session("s Example") = "This is an
example"

End If

End Sub

[=?Utf-8?B?TWlsb3N6IFNrYWxlY2tpIFtNQ0FEXQ==?=]

Howdy,

You have to call Server.ClearErr or method after handling Application.OnE rror
event in order to prevent thread from being aborted (unhandled exception).
Without doing so, ASP.NET runtime assumes exception has not been handled and
stops the execution before session state is updated with chages.

Sub Application_Err or(ByVal sender As Object, _
ByVal e As EventArgs)
' Fires when an error occurs
Dim ex As Exception = Server.GetLastE rror()
If Not ex.InnerExcepti on Is Nothing AndAlso _
TypeOf ex.InnerExcepti on Is System.IO.FileN otFoundExceptio n Then
HttpContext.Cur rent.Session("s Example") = "This is an example"
Server.ClearErr or()
End If

End Sub

hope this helps

--
Milosz
"bm*****@gmail. com" wrote:

On Mar 25, 1:24 pm, "Juan T. Llibre" <nomailrepl...@ nowhere.com>
wrote:

Post the code which is failing.

Juan T. Llibre, asp.net MVP
asp.net faq :http://asp.net.do/faq/
foros de asp.net, en español :http://asp.net.do/foros/
=============== =============== =====

<bmuk...@gmail. comwrote in messagenews:11* *************** ******@y66g2000 hsf.googlegroup s.com...

Hi,

I am trying to add some error handling in a Global.asax file. I am
declaring a session variable within the Application_Err or procedure.
However, everytime i try to pass something into the sessionstate i get
a error message of 'Object reference not set to an instance of an
object.' Is there any workaround for this? And why am I getting this
error?

Thanks in advance- Hide quoted text -

- Show quoted text -

Here is the code:
Sub Application_Err or(ByVal sender As Object, ByVal e As
EventArgs)
' Fires when an error occurs
Dim ex As Exception = Server.GetLastE rror()
If Not ex.InnerExcepti on Is Nothing AndAlso TypeOf
ex.InnerExcepti on Is System.IO.FileN otFoundExceptio n Then
HttpContext.Cur rent.Session("s Example") = "This is an
example"

End If

End Sub

[=?Utf-8?B?TWlsb3N6IFNrYWxlY2tpIFtNQ0FEXQ==?=]

Hi Goran,

If HttpContext.Cur rent was null he would get null reference exception. The
problem he described is definitely related to unhandeld exception, that
prevents session state to updated (i tesetd it), therefore he must call
Server.ClearErr or afterwards.

Best regards
--
Milosz
"Göran Andersson" wrote:

bm*****@gmail.c om wrote:

On Mar 25, 1:24 pm, "Juan T. Llibre" <nomailrepl...@ nowhere.com>
wrote:

Post the code which is failing.

Juan T. Llibre, asp.net MVP
asp.net faq :http://asp.net.do/faq/
foros de asp.net, en español :http://asp.net.do/foros/
=============== =============== =====

<bmuk...@gmail. comwrote in messagenews:11* *************** ******@y66g2000 hsf.googlegroup s.com...
Hi,
I am trying to add some error handling in a Global.asax file. I am
declaring a session variable within the Application_Err or procedure.
However, everytime i try to pass something into the sessionstate i get
a error message of 'Object reference not set to an instance of an
object.' Is there any workaround for this? And why am I getting this
error?
Thanks in advance- Hide quoted text -
- Show quoted text -

Here is the code:
Sub Application_Err or(ByVal sender As Object, ByVal e As
EventArgs)
' Fires when an error occurs
Dim ex As Exception = Server.GetLastE rror()
If Not ex.InnerExcepti on Is Nothing AndAlso TypeOf
ex.InnerExcepti on Is System.IO.FileN otFoundExceptio n Then
HttpContext.Cur rent.Session("s Example") = "This is an
example"

End If

End Sub

You have to check if you have an HttpContext object before you try to
use it. It's not at all certain that the code where the error occurs has
a http context at all.

--
Göran Andersson
_____
http://www.guffa.com

[=?UTF-8?B?R8O2cmFuIEFuZGVyc3Nvbg==?=]

Milosz Skalecki [MCAD] wrote:

Hi Goran,

If HttpContext.Cur rent was null he would get null reference exception.

If you read the original post again, you'll see that this is exactly
what he is getting.

The
problem he described is definitely related to unhandeld exception, that
prevents session state to updated (i tesetd it), therefore he must call
Server.ClearErr or afterwards.

Best regards

--
Göran Andersson
_____
http://www.guffa.com

[=?Utf-8?B?TWlsb3N6IFNrYWxlY2tpIFtNQ0FEXQ==?=]

Good call Goran, your're right. I thought he could not read the information
already stored- I must have been very sleepy at the time i replied :)

Regards
--
Milosz
"Göran Andersson" wrote:

Milosz Skalecki [MCAD] wrote:

Hi Goran,

If HttpContext.Cur rent was null he would get null reference exception.

If you read the original post again, you'll see that this is exactly
what he is getting.

The
problem he described is definitely related to unhandeld exception, that
prevents session state to updated (i tesetd it), therefore he must call
Server.ClearErr or afterwards.

Best regards

--
Göran Andersson
_____
http://www.guffa.com