object reference not set to an instance of an object

#1 December 28th, 2006, 06:45 PM

Hi,

Very new to asp.net. Using VStudio 2005 on an XP Pro machine. Using Cassini
to view.

I see this error discussed all over the net but don't seem to find a way to
resolve my particular grief -- which I am sure is not unique. Here are my
basic steps:

1) create a masterpage -- add some simple graphics to the header.
2) add a new web form that references the master page and attaches a code
behind file. (actually added 3 files referencing the same mpage -- each
errors)
3) add some basic html into the placeholder auto-created in the web form
page, ie:

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">

</asp:Content>

4) view the page and it all views okay.

But when I look at the page in design mode -- the Content placeholder shows
this error -- and it is referenced in the error list as well.

================
Error creating control - Content1
object reference not set to an instance of an object
================

Can anyone give me a heads up as to what this error means, how to get rid of
it, etc. I am guessing that it wants me to declare an object -- but where
(assuming codebehind file) and I am wondering why vstudio doesn't auto do
it? - which makes me think my guess is wrong.

thanks

#2 December 28th, 2006, 06:55 PM

save your project , close out and reopen, that usually clears that problem up for me.

"thersitz" <thersitz@gmail.comwrote in message news:uSQH0crKHHA.1240@TK2MSFTNGP03.phx.gbl...

Quote:

Hi,
>
Very new to asp.net. Using VStudio 2005 on an XP Pro machine. Using Cassini to view.
>
I see this error discussed all over the net but don't seem to find a way to resolve my particular grief -- which I am sure is not
unique. Here are my basic steps:
>
1) create a masterpage -- add some simple graphics to the header.
2) add a new web form that references the master page and attaches a code behind file. (actually added 3 files referencing the
same mpage -- each errors)
3) add some basic html into the placeholder auto-created in the web form page, ie:
>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
>
</asp:Content>
>
>
4) view the page and it all views okay.
>
But when I look at the page in design mode -- the Content placeholder shows this error -- and it is referenced in the error list
as well.
>
================
Error creating control - Content1
object reference not set to an instance of an object
================
>
Can anyone give me a heads up as to what this error means, how to get rid of it, etc. I am guessing that it wants me to declare an
object -- but where (assuming codebehind file) and I am wondering why vstudio doesn't auto do it? - which makes me think my guess
is wrong.
>
thanks
>
>
>

#3 December 28th, 2006, 07:15 PM

Thanks Jon. I saw that suggestion in one of my google returns and tried
it -- but to no avail.

I've been playing around a bit and have noticed that this error does not
show until I paste in some basic html. I am going slowly into this aspNet
thing and am still using some traditional html -- div, p, table -- as i get
a feel for vstudio etc -- not using the html controls.

So my html is producing the error -- but why?

"Jon Paal" <Jon[ nospam ]Paal @ everywhere dot comwrote in message
news:OUl5vjrKHHA.448@TK2MSFTNGP04.phx.gbl...

Quote:

save your project , close out and reopen, that usually clears that problem
up for me.
>
>
"thersitz" <thersitz@gmail.comwrote in message
news:uSQH0crKHHA.1240@TK2MSFTNGP03.phx.gbl...

Quote:

>Hi,
>>
>Very new to asp.net. Using VStudio 2005 on an XP Pro machine. Using
>Cassini to view.
>>
>I see this error discussed all over the net but don't seem to find a way
>to resolve my particular grief -- which I am sure is not unique. Here are
>my basic steps:
>>
>1) create a masterpage -- add some simple graphics to the header.
>2) add a new web form that references the master page and attaches a code
>behind file. (actually added 3 files referencing the same mpage -- each
>errors)
>3) add some basic html into the placeholder auto-created in the web form
>page, ie:
>>
><asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
>Runat="Server">
>>
></asp:Content>
>>
>>
>4) view the page and it all views okay.
>>
>But when I look at the page in design mode -- the Content placeholder
>shows this error -- and it is referenced in the error list as well.
>>
>================
>Error creating control - Content1
>object reference not set to an instance of an object
>================
>>
>Can anyone give me a heads up as to what this error means, how to get rid
>of it, etc. I am guessing that it wants me to declare an object -- but
>where (assuming codebehind file) and I am wondering why vstudio doesn't
>auto do it? - which makes me think my guess is wrong.
>>
>thanks
>>
>>
>>

>
>

#4 December 28th, 2006, 08:06 PM

Well I have narrowed the source of the error to this piece of code:



So I just need to come up with an aspnet version of this code.

thanks

"thersitz" <thersitz@gmail.comwrote in message
news:uSQH0crKHHA.1240@TK2MSFTNGP03.phx.gbl...

Quote:

Hi,
>
Very new to asp.net. Using VStudio 2005 on an XP Pro machine. Using
Cassini to view.
>
I see this error discussed all over the net but don't seem to find a way
to resolve my particular grief -- which I am sure is not unique. Here are
my basic steps:
>
1) create a masterpage -- add some simple graphics to the header.
2) add a new web form that references the master page and attaches a code
behind file. (actually added 3 files referencing the same mpage -- each
errors)
3) add some basic html into the placeholder auto-created in the web form
page, ie:
>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
>
</asp:Content>
>
>
4) view the page and it all views okay.
>
But when I look at the page in design mode -- the Content placeholder
shows this error -- and it is referenced in the error list as well.
>
================
Error creating control - Content1
object reference not set to an instance of an object
================
>
Can anyone give me a heads up as to what this error means, how to get rid
of it, etc. I am guessing that it wants me to declare an object -- but
where (assuming codebehind file) and I am wondering why vstudio doesn't
auto do it? - which makes me think my guess is wrong.
>
thanks
>
>
>

#5 December 29th, 2006, 03:15 AM

Try just running that piece of code by itself (copy it to a blank web page)
It sounds like something in particular on that page might be causing the
problem.

--
David Wier
MVP/ASPInsider
http://aspnet101.com
http://aspexpress.com

"thersitz" <thersitz@gmail.comwrote in message
news:uybzSKsKHHA.4460@TK2MSFTNGP03.phx.gbl...

Quote:

Well I have narrowed the source of the error to this piece of code:
>

>
So I just need to come up with an aspnet version of this code.
>
thanks
>
>
>
>
"thersitz" <thersitz@gmail.comwrote in message
news:uSQH0crKHHA.1240@TK2MSFTNGP03.phx.gbl...

Quote:

>Hi,
>>
>Very new to asp.net. Using VStudio 2005 on an XP Pro machine. Using
>Cassini to view.
>>
>I see this error discussed all over the net but don't seem to find a way
>to resolve my particular grief -- which I am sure is not unique. Here are
>my basic steps:
>>
>1) create a masterpage -- add some simple graphics to the header.
>2) add a new web form that references the master page and attaches a code
>behind file. (actually added 3 files referencing the same mpage -- each
>errors)
>3) add some basic html into the placeholder auto-created in the web form
>page, ie:
>>
><asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
>Runat="Server">
>>
></asp:Content>
>>
>>
>4) view the page and it all views okay.
>>
>But when I look at the page in design mode -- the Content placeholder
>shows this error -- and it is referenced in the error list as well.
>>
>================
>Error creating control - Content1
>object reference not set to an instance of an object
>================
>>
>Can anyone give me a heads up as to what this error means, how to get rid
>of it, etc. I am guessing that it wants me to declare an object -- but
>where (assuming codebehind file) and I am wondering why vstudio doesn't
>auto do it? - which makes me think my guess is wrong.
>>
>thanks
>>
>>
>>

>
>

#6 December 29th, 2006, 03:15 AM

Try just running that piece of code by itself (copy it to a blank web page)
It sounds like something in particular on that page might be causing the
problem.

--
David Wier
MVP/ASPInsider
http://aspnet101.com
http://aspexpress.com

"thersitz" <thersitz@gmail.comwrote in message
news:uybzSKsKHHA.4460@TK2MSFTNGP03.phx.gbl...

Quote:

Well I have narrowed the source of the error to this piece of code:
>

>
So I just need to come up with an aspnet version of this code.
>
thanks
>
>
>
>
"thersitz" <thersitz@gmail.comwrote in message
news:uSQH0crKHHA.1240@TK2MSFTNGP03.phx.gbl...

Quote:

>Hi,
>>
>Very new to asp.net. Using VStudio 2005 on an XP Pro machine. Using
>Cassini to view.
>>
>I see this error discussed all over the net but don't seem to find a way
>to resolve my particular grief -- which I am sure is not unique. Here are
>my basic steps:
>>
>1) create a masterpage -- add some simple graphics to the header.
>2) add a new web form that references the master page and attaches a code
>behind file. (actually added 3 files referencing the same mpage -- each
>errors)
>3) add some basic html into the placeholder auto-created in the web form
>page, ie:
>>
><asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
>Runat="Server">
>>
></asp:Content>
>>
>>
>4) view the page and it all views okay.
>>
>But when I look at the page in design mode -- the Content placeholder
>shows this error -- and it is referenced in the error list as well.
>>
>================
>Error creating control - Content1
>object reference not set to an instance of an object
>================
>>
>Can anyone give me a heads up as to what this error means, how to get rid
>of it, etc. I am guessing that it wants me to declare an object -- but
>where (assuming codebehind file) and I am wondering why vstudio doesn't
>auto do it? - which makes me think my guess is wrong.
>>
>thanks
>>
>>
>>

>
>

#7 January 22nd, 2007, 01:25 AM

I am having the same issue. I have a master page with one editable region. When I use the master and place plain html 4.0 data in the editable region it creates this error while in design view. Error Creating Control - Content1 Object Reference not set to an instance of an object.

The page renders correctly and build correctly. I have restart and tried various data. Is it becuase I am creating the page in another folder other than the master page. Even though it is looking for web root is it confused?

The page directive looks like this:

<%@ Page Language="C#" MasterPageFile="~/public/Public.master" >>The rest is normal stuff.

My Directory structure is:

/
/public
/public/info
/public/news
/public/...more folders

my master is in /public/Public.master

The pages I am having issues in are the subfolders

/public/info/page_one.aspx

The files in the same folder as the master works fine:
/public/public.Master
/public/Default.aspx

Thanks

EggHeadCafe.com - .NET Developer Portal of Choice
http://www.eggheadcafe.com

#8 January 27th, 2007, 02:25 PM

you may find the answer here.

http://odetocode.com/Articles/450.aspx

Mike

On Jan 21, 9:20 pm, Tom wrote:

Quote:

I am having the same issue. I have amasterpagewith one editable region. When I use themasterand place plain html 4.0 data in the editable region it creates this error while in design view. Error Creating Control - Content1ObjectReferencenotsetto aninstanceof anobject.
>
Thepagerenders correctly and build correctly. I have restart and tried various data. Is it becuase I am creating thepagein another folder other than themasterpage. Even though it is looking for web root is it confused?
>
Thepagedirective looks like this:
>
<%@PageLanguage="C#" MasterPageFile="~/public/Public.master" >>The rest is normal stuff.
>
My Directory structure is:
>
/
/public
/public/info
/public/news
/public/...more folders
>
mymasteris in /public/Public.master
>
The pages I am having issues in are the subfolders
>
/public/info/page_one.aspx
>
The files in the same folder as themasterworks fine:
/public/public.Master
/public/Default.aspx
>
Thanks
>
EggHeadCafe.com - .NET Developer Portal of Choicehttp://www.eggheadcafe.com

object reference not set to an instance of an object

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