Mysterious Error: Object reference not set to an instance of an object

[Max]

Hi There!

I'm having a mysterious error right after I login using Forms Authentication
in my ASP.NET app. Below is the error...

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

The exception throws at the code that tries to set a property (String data
type) at my Menu user control.

When I refresh the page, the page render successfully without any
exceptions! Why?? My conclusion is that there are no exceptions in the first
place. I can't think why ASP.NET throws the exception when I access the page
for first time but not the second time! This exception is totally
unpredictable and unreasonable!

Plz help!!!

My SYS specs are...
- ASP.NET 1.1
- Windows XP (This error also occurs on Windows 2000 and Windows Server 2003
as well)

Thank you all in advance.

Max

[cmay]

Probably not going to help, but I had a similar issue when trying to access
public properties of a web user control (I think thats what it's called... an
ASCX control).

For some reason the control wasn't be instantiated correctly, or posted back
to correctly.

I created a second page exactly in the same manner as the first, copied the
code and it worked. I deleted the first page, renamed the 2nd to the right
name and moved on.

If you make a brand new page w/ nothing but your control on it does it fail
as well?
"Max" wrote:

Hi There!

I'm having a mysterious error right after I login using Forms Authentication
in my ASP.NET app. Below is the error...

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

The exception throws at the code that tries to set a property (String data
type) at my Menu user control.

When I refresh the page, the page render successfully without any
exceptions! Why?? My conclusion is that there are no exceptions in the first
place. I can't think why ASP.NET throws the exception when I access the page
for first time but not the second time! This exception is totally
unpredictable and unreasonable!

Plz help!!!

My SYS specs are...
- ASP.NET 1.1
- Windows XP (This error also occurs on Windows 2000 and Windows Server 2003
as well)

Thank you all in advance.

Max

[Kevin Spencer]

The NullReferenceEx ception indicates that you are referencing an object in a
line of code, and that the object is null, or Nothing. It is not
instantiated. If you post the line of code which throws the exception, I can
tell you all of the object references in the line of code which may or may
not be null. After that, it will be up to you to determine which, and why.

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
Neither a follower nor a lender be.

"Max" <ze**@maxdot.co m.com> wrote in message
news:Ox******** ********@TK2MSF TNGP15.phx.gbl. ..

Hi There!

I'm having a mysterious error right after I login using Forms
Authentication in my ASP.NET app. Below is the error...

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

The exception throws at the code that tries to set a property (String data
type) at my Menu user control.

When I refresh the page, the page render successfully without any
exceptions! Why?? My conclusion is that there are no exceptions in the
first place. I can't think why ASP.NET throws the exception when I access
the page for first time but not the second time! This exception is totally
unpredictable and unreasonable!

Plz help!!!

My SYS specs are...
- ASP.NET 1.1
- Windows XP (This error also occurs on Windows 2000 and Windows Server
2003 as well)

Thank you all in advance.

Max

[Navajo Boy]

Inside the Page_Load function on the page i believe there is a
if(!Page.IsPost Back)
that is loading the Object. Look there.

Kevin Spencer wrote:

The NullReferenceEx ception indicates that you are referencing an object in a line of code, and that the object is null, or Nothing. It is not
instantiated. If you post the line of code which throws the exception, I can tell you all of the object references in the line of code which may or may not be null. After that, it will be up to you to determine which, and why.
--
HTH,

Kevin Spencer
Microsoft MVP
.Net Developer
Neither a follower nor a lender be.

"Max" <ze**@maxdot.co m.com> wrote in message
news:Ox******** ********@TK2MSF TNGP15.phx.gbl. ..

Hi There!

I'm having a mysterious error right after I login using Forms
Authentication in my ASP.NET app. Below is the error...

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

The exception throws at the code that tries to set a property (String data type) at my Menu user control.

When I refresh the page, the page render successfully without any
exceptions! Why?? My conclusion is that there are no exceptions in the first place. I can't think why ASP.NET throws the exception when I access the page for first time but not the second time! This exception is totally unpredictable and unreasonable!

Plz help!!!

My SYS specs are...
- ASP.NET 1.1
- Windows XP (This error also occurs on Windows 2000 and Windows Server 2003 as well)

Thank you all in advance.

Max

[Kevin Spencer]

Are you the same person who asked the original question? If so, you need to
post the offending line of code. If not, what the heck are you talking
about?

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
Neither a follower nor a lender be.

"Navajo Boy" <na***********@ rocketmail.com> wrote in message
news:11******** **************@ c13g2000cwb.goo glegroups.com.. .

Inside the Page_Load function on the page i believe there is a
if(!Page.IsPost Back)
that is loading the Object. Look there.

Kevin Spencer wrote:

The NullReferenceEx ception indicates that you are referencing an

object in a

line of code, and that the object is null, or Nothing. It is not
instantiated. If you post the line of code which throws the

exception, I can

tell you all of the object references in the line of code which may

or may

not be null. After that, it will be up to you to determine which, and

why.

--
HTH,

Kevin Spencer
Microsoft MVP
.Net Developer
Neither a follower nor a lender be.

"Max" <ze**@maxdot.co m.com> wrote in message
news:Ox******** ********@TK2MSF TNGP15.phx.gbl. ..

> Hi There!
>
> I'm having a mysterious error right after I login using Forms
> Authentication in my ASP.NET app. Below is the error...
>
> Exception Details: System.NullRefe renceException: Object reference not set > to an instance of an object.
>
> The exception throws at the code that tries to set a property (String data > type) at my Menu user control.
>
> When I refresh the page, the page render successfully without any
> exceptions! Why?? My conclusion is that there are no exceptions in the > first place. I can't think why ASP.NET throws the exception when I access > the page for first time but not the second time! This exception is totally > unpredictable and unreasonable!
>
> Plz help!!!
>
> My SYS specs are...
> - ASP.NET 1.1
> - Windows XP (This error also occurs on Windows 2000 and Windows Server > 2003 as well)
>
> Thank you all in advance.
>
> Max
>

[Yatendra Khandelwal]

I think Navajo is right... the problem lies in 'if(!Page.IsPos tBack)' of
Page_Load().
...... whenever any control does a postback it goes through the
Page_Load() again. So the code that we donot want to run on every postback we
give in 'if(!Page.IsPos tBack) {...}'. The code inside this loop only executes
when the page is loaded for the first time or an equivalent situation when we
refresh the page. I think thts where your problem lies Max. I think you are
initialising the menu control inside this if loop and somehow somewhere your
menu control loses its value, b4 coming back to page_load() on some postback.
And when it comes there its does not initialise the menu control as this code
is inside the if loop and it goes inside the if loop only when its not a
postback.
If you are initialising menu control in Page_Load() inside the
'if(!Page.IsPos tBack)' try doing it outside this loop.
I am not very sure of your problem but if what I think your problem is is
correct then I guess this should work.
"Kevin Spencer" wrote:

Are you the same person who asked the original question? If so, you need to
post the offending line of code. If not, what the heck are you talking
about?

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
Neither a follower nor a lender be.

"Navajo Boy" <na***********@ rocketmail.com> wrote in message
news:11******** **************@ c13g2000cwb.goo glegroups.com.. .

Inside the Page_Load function on the page i believe there is a
if(!Page.IsPost Back)
that is loading the Object. Look there.

Kevin Spencer wrote:

The NullReferenceEx ception indicates that you are referencing an

object in a

line of code, and that the object is null, or Nothing. It is not
instantiated. If you post the line of code which throws the

exception, I can

tell you all of the object references in the line of code which may

or may

not be null. After that, it will be up to you to determine which, and

why.

--
HTH,

Kevin Spencer
Microsoft MVP
.Net Developer
Neither a follower nor a lender be.

"Max" <ze**@maxdot.co m.com> wrote in message
news:Ox******** ********@TK2MSF TNGP15.phx.gbl. ..
> Hi There!
>
> I'm having a mysterious error right after I login using Forms
> Authentication in my ASP.NET app. Below is the error...
>
> Exception Details: System.NullRefe renceException: Object reference

not set

> to an instance of an object.
>
> The exception throws at the code that tries to set a property

(String data

> type) at my Menu user control.
>
> When I refresh the page, the page render successfully without any
> exceptions! Why?? My conclusion is that there are no exceptions in

the

> first place. I can't think why ASP.NET throws the exception when I

access

> the page for first time but not the second time! This exception is

totally

> unpredictable and unreasonable!
>
> Plz help!!!
>
> My SYS specs are...
> - ASP.NET 1.1
> - Windows XP (This error also occurs on Windows 2000 and Windows

Server

> 2003 as well)
>
> Thank you all in advance.
>
> Max
>

[Yatendra Khandelwal]

but yeah one should be really cautious putting some code outside
'if(!Page.IsPos tBack)' as it may have negetive impact on performance.
"Yatendra Khandelwal" wrote:

I think Navajo is right... the problem lies in 'if(!Page.IsPos tBack)' of
Page_Load().
...... whenever any control does a postback it goes through the
Page_Load() again. So the code that we donot want to run on every postback we
give in 'if(!Page.IsPos tBack) {...}'. The code inside this loop only executes
when the page is loaded for the first time or an equivalent situation when we
refresh the page. I think thts where your problem lies Max. I think you are
initialising the menu control inside this if loop and somehow somewhere your
menu control loses its value, b4 coming back to page_load() on some postback.
And when it comes there its does not initialise the menu control as this code
is inside the if loop and it goes inside the if loop only when its not a
postback.
If you are initialising menu control in Page_Load() inside the
'if(!Page.IsPos tBack)' try doing it outside this loop.
I am not very sure of your problem but if what I think your problem is is
correct then I guess this should work.
"Kevin Spencer" wrote:

Are you the same person who asked the original question? If so, you need to
post the offending line of code. If not, what the heck are you talking
about?

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
Neither a follower nor a lender be.

"Navajo Boy" <na***********@ rocketmail.com> wrote in message
news:11******** **************@ c13g2000cwb.goo glegroups.com.. .

Inside the Page_Load function on the page i believe there is a
if(!Page.IsPost Back)
that is loading the Object. Look there.

Kevin Spencer wrote:
> The NullReferenceEx ception indicates that you are referencing an
object in a
> line of code, and that the object is null, or Nothing. It is not
> instantiated. If you post the line of code which throws the
exception, I can
> tell you all of the object references in the line of code which may
or may
> not be null. After that, it will be up to you to determine which, and
why.
>
> --
> HTH,
>
> Kevin Spencer
> Microsoft MVP
> .Net Developer
> Neither a follower nor a lender be.
>
> "Max" <ze**@maxdot.co m.com> wrote in message
> news:Ox******** ********@TK2MSF TNGP15.phx.gbl. ..
> > Hi There!
> >
> > I'm having a mysterious error right after I login using Forms
> > Authentication in my ASP.NET app. Below is the error...
> >
> > Exception Details: System.NullRefe renceException: Object reference
not set
> > to an instance of an object.
> >
> > The exception throws at the code that tries to set a property
(String data
> > type) at my Menu user control.
> >
> > When I refresh the page, the page render successfully without any
> > exceptions! Why?? My conclusion is that there are no exceptions in
the
> > first place. I can't think why ASP.NET throws the exception when I
access
> > the page for first time but not the second time! This exception is
totally
> > unpredictable and unreasonable!
> >
> > Plz help!!!
> >
> > My SYS specs are...
> > - ASP.NET 1.1
> > - Windows XP (This error also occurs on Windows 2000 and Windows
Server
> > 2003 as well)
> >
> > Thank you all in advance.
> >
> > Max
> >

[Max]

I did that and the same exception thrown when I refresh the page repadily.

max

"cmay" <cm**@discussio ns.microsoft.co m> wrote in message
news:B5******** *************** ***********@mic rosoft.com...

Probably not going to help, but I had a similar issue when trying to
access
public properties of a web user control (I think thats what it's called...
an
ASCX control).

For some reason the control wasn't be instantiated correctly, or posted
back
to correctly.

I created a second page exactly in the same manner as the first, copied
the
code and it worked. I deleted the first page, renamed the 2nd to the
right
name and moved on.

If you make a brand new page w/ nothing but your control on it does it
fail
as well?
"Max" wrote:

Hi There!

I'm having a mysterious error right after I login using Forms
Authentication
in my ASP.NET app. Below is the error...

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

The exception throws at the code that tries to set a property (String
data
type) at my Menu user control.

When I refresh the page, the page render successfully without any
exceptions! Why?? My conclusion is that there are no exceptions in the
first
place. I can't think why ASP.NET throws the exception when I access the
page
for first time but not the second time! This exception is totally
unpredictable and unreasonable!

Plz help!!!

My SYS specs are...
- ASP.NET 1.1
- Windows XP (This error also occurs on Windows 2000 and Windows Server
2003
as well)

Thank you all in advance.

Max

[Max]

Hi Kevin,

Thanks for the reply.

What I have is an ASPX page, with one Header.ascx control which accepts
comma delimited menu items (such as Menu1,Menu2,Men u3). For testing
purposes, I've created a blank ASPX page with only header ASCX control on it
and on Page_Load, I set the menu items "Menu1,Menu2,Me nu3".

I refresh the page rapidly. Every two or three refresh, I get the "Object
reference not set to an instance of an object" at the point where I tried to
assign the menu item values. So I commented out that line and I tried to
access MenuBarColor property of the header control. The SAME error
produces!!! So I concluded that my Header control is not instantiated for
some reason when I do rapid refresh.

Is this normal for ASP.NET to produce this error when rapidly refreshed or
what I'm doing wrong?

max

"Kevin Spencer" <ke***@DIESPAMM ERSDIEtakempis. com> wrote in message
news:er******** ******@TK2MSFTN GP12.phx.gbl...

The NullReferenceEx ception indicates that you are referencing an object in
a line of code, and that the object is null, or Nothing. It is not
instantiated. If you post the line of code which throws the exception, I
can tell you all of the object references in the line of code which may or
may not be null. After that, it will be up to you to determine which, and
why.

--
HTH,

Kevin Spencer
Microsoft MVP
.Net Developer
Neither a follower nor a lender be.

"Max" <ze**@maxdot.co m.com> wrote in message
news:Ox******** ********@TK2MSF TNGP15.phx.gbl. ..

Hi There!

I'm having a mysterious error right after I login using Forms
Authentication in my ASP.NET app. Below is the error...

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

The exception throws at the code that tries to set a property (String
data type) at my Menu user control.

When I refresh the page, the page render successfully without any
exceptions! Why?? My conclusion is that there are no exceptions in the
first place. I can't think why ASP.NET throws the exception when I access
the page for first time but not the second time! This exception is
totally unpredictable and unreasonable!

Plz help!!!

My SYS specs are...
- ASP.NET 1.1
- Windows XP (This error also occurs on Windows 2000 and Windows Server
2003 as well)

Thank you all in advance.

Max

[Max]

Hi Yatendra,

My page does not utilize the Page.IsPostBack .

max

"Yatendra Khandelwal" <ya************ *****@ishisyste ms.com.(donotsp am)>
wrote in message news:14******** *************** ***********@mic rosoft.com...

I think Navajo is right... the problem lies in 'if(!Page.IsPos tBack)' of
Page_Load().
...... whenever any control does a postback it goes through the
Page_Load() again. So the code that we donot want to run on every postback
we
give in 'if(!Page.IsPos tBack) {...}'. The code inside this loop only
executes
when the page is loaded for the first time or an equivalent situation when
we
refresh the page. I think thts where your problem lies Max. I think you
are
initialising the menu control inside this if loop and somehow somewhere
your
menu control loses its value, b4 coming back to page_load() on some
postback.
And when it comes there its does not initialise the menu control as this
code
is inside the if loop and it goes inside the if loop only when its not a
postback.
If you are initialising menu control in Page_Load() inside the
'if(!Page.IsPos tBack)' try doing it outside this loop.
I am not very sure of your problem but if what I think your problem is is
correct then I guess this should work.
"Kevin Spencer" wrote:

Are you the same person who asked the original question? If so, you need
to
post the offending line of code. If not, what the heck are you talking
about?

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
Neither a follower nor a lender be.

"Navajo Boy" <na***********@ rocketmail.com> wrote in message
news:11******** **************@ c13g2000cwb.goo glegroups.com.. .

> Inside the Page_Load function on the page i believe there is a
> if(!Page.IsPost Back)
> that is loading the Object. Look there.
>
>
>
> Kevin Spencer wrote:
>> The NullReferenceEx ception indicates that you are referencing an
> object in a
>> line of code, and that the object is null, or Nothing. It is not
>> instantiated. If you post the line of code which throws the
> exception, I can
>> tell you all of the object references in the line of code which may
> or may
>> not be null. After that, it will be up to you to determine which, and
> why.
>>
>> --
>> HTH,
>>
>> Kevin Spencer
>> Microsoft MVP
>> .Net Developer
>> Neither a follower nor a lender be.
>>
>> "Max" <ze**@maxdot.co m.com> wrote in message
>> news:Ox******** ********@TK2MSF TNGP15.phx.gbl. ..
>> > Hi There!
>> >
>> > I'm having a mysterious error right after I login using Forms
>> > Authentication in my ASP.NET app. Below is the error...
>> >
>> > Exception Details: System.NullRefe renceException: Object reference
> not set
>> > to an instance of an object.
>> >
>> > The exception throws at the code that tries to set a property
> (String data
>> > type) at my Menu user control.
>> >
>> > When I refresh the page, the page render successfully without any
>> > exceptions! Why?? My conclusion is that there are no exceptions in
> the
>> > first place. I can't think why ASP.NET throws the exception when I
> access
>> > the page for first time but not the second time! This exception is
> totally
>> > unpredictable and unreasonable!
>> >
>> > Plz help!!!
>> >
>> > My SYS specs are...
>> > - ASP.NET 1.1
>> > - Windows XP (This error also occurs on Windows 2000 and Windows
> Server
>> > 2003 as well)
>> >
>> > Thank you all in advance.
>> >
>> > Max
>> >
>