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AJAX: Unknown server tag 'asp:ScriptManager'.

I just spent an unhealthy amount of time trying to figure out this error:

Unknown server tag 'asp:ScriptManager'.

I was baffled because I already had a reference to AjaxControlToolkit.dll in my project, and I had what I thought was a web.config ready to handle any AJAX requests. It turned out adding the section below to system.web fixed the problem.

<pages>

</controls>

</pages>

Print | posted on Wednesday, May 16, 2007 11:54 AM

Comments

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Keith Rull

I usually rename the tagpreffix to something like aspajax whenever i start an ASP.NET Ajax project because the VS.NET IDE gets clunky all the time whenever it can't find the control in the default asp namespace.

Posted @ 5/16/2007 10:14 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Steve K

perfect! worked like a charm

Posted @ 6/8/2007 3:17 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

A. J.

Hello there

How did you rename the tagpreffix ??

Posted @ 7/27/2007 9:15 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Public

What is PublicKeyToken?

Posted @ 10/28/2007 4:50 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Alex Bransky

http://msdn2.microsoft.com/en-us/library/system.reflection.assemblyname.getpublickeytoken.aspx

Posted @ 10/29/2007 4:19 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Raj

Could you please give step by step

Posted @ 11/29/2007 10:33 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Nassero

1) Create a web.config for your app.
2) add the <Pages>...</Pages> given in the frist post above to <System.Web> element in the web.config.
something like this:
.....
<System.Web>
.........
.........
<pages>

<controls>

<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />

</controls>

</pages>
</System.Web>

Hope this helps.

Posted @ 2/17/2008 12:30 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

donoho

Thanks for taking to time post the fruits of your labor... tasty.

Posted @ 4/2/2008 7:23 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

lakshmi

thanks a lot!

Posted @ 4/16/2008 8:15 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Omid

Thanx! helped me much :)

Posted @ 5/7/2008 11:20 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Larry

Thanks, this fixed my problem

Posted @ 6/12/2008 9:12 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Munish

Good solution...worked for me... :)

Posted @ 7/6/2008 11:54 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

helen

Hi i have done all the above but yet my error ( Unknown server tag 'asp:ScriptManager'.) is found any one help me please

Posted @ 7/23/2008 11:50 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Joe

Thanks buddy it solves my problem...!!

Posted @ 8/29/2008 11:04 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Thanks so much for this, sorted me out.

Posted @ 9/28/2008 10:57 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

dhanesh

thanks.It works...

Posted @ 9/29/2008 2:09 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Charu Agarwal

thanks a lot for sharing. It saved me a lot of time.

Posted @ 10/14/2008 11:48 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

mahesh

Thanks buddy. It was very useful.

Posted @ 10/23/2008 1:38 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

mighty

me no saber

Posted @ 11/3/2008 11:59 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

andyoye

I don't see <pages> in my web.config. I do see

There is only one entry or "pages" found in my web.config file

<pages enableSessionState="false" enableViewState="true" enableViewStateMac="true" validateRequest="false" .............
</pages>
is this where I add the post lines?

Thanks

Posted @ 11/6/2008 1:38 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Gaurav Shah

i have already register and make tag prefix stil error comming.
pls give me solutin quick.

here i describe my register tag code
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

in advance thank you

Posted @ 11/17/2008 5:11 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

itrickski

THANK YOU for saving the rest of us hours and hours of searching. worked like a charm!

Posted @ 11/20/2008 9:12 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

abhishek

I added <pages> in my web.config. It worked!!!

But i m getting follwing error in Mozilla Firefox

Error: uncaught exception: [Exception... "An invalid or illegal string was specified" code: "12" nsresult: "0x8053000c (NS_ERROR_DOM_SYNTAX_ERR)" location:

Plz help.....

thanks in advance ....Alex

Posted @ 12/14/2008 6:40 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

jsimhan

Thanks a lot. After seeing the reference here I could fix the problem.

If you have the default "cc1" as your prefix after including ajax toolkit, the web.config file should have entry as follows if you include webservice references.

<pages>
<controls>
<add tagPrefix="cc1" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
</controls>
</pages>

Posted @ 1/5/2009 4:36 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

webdesign @ PK

We had the same problem it worked like a charm!

Posted @ 2/3/2009 7:26 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Gane

Hi, Thanks man, its sorted out my problem

Posted @ 2/5/2009 7:40 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

osman kasapoğlu

adding AjaxControlToolkit.dll in your bin folder. build your project in .net framework 3.5 mode

Posted @ 2/18/2009 1:11 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

priyanka

thnks it really good.it is stret forward solution.i like this article

Posted @ 2/25/2009 6:36 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Vito

an unhealthy amount of time

Posted @ 3/18/2009 2:40 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Ashandra Singh

<pages>
<controls>
<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</controls>
</pages>

Add the above lines to your web config inside the <system.web> root element.

Basically it loads the approriate assemblies.

Posted @ 4/5/2009 10:52 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

suri

the solution is

with in this tag

add this assembly code.

<pages>

<controls>

<add tagPrefix="nw" namespace="ErrorPopup" assembly="ErrorPopup"/>

</controls>

</pages>

Posted @ 5/5/2009 12:11 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Raj

My huge thanks to "Nassero"

ur code snippet solved my issue in rectifying the error message of scriptmanager.

Thanks a lot.

grt work by you.

bye

Posted @ 5/20/2009 6:19 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Anders

Hi, thanks, thoough I had to struggle with the web.config this helped me to another step further.
No I'm banging my head towards how to set the permissions correctly, but that is another thread I think.
/a

Posted @ 6/5/2009 6:32 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Marcel Bradea

For my generated Silverlight web site project there was no web.config, so it took a simple addition of a Web Configuration Item for this to work. These lines were added in automatically from that template.

Cheers!

Posted @ 7/8/2009 11:39 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Kam

Great tip, works in SharePoint as well.

Posted @ 7/9/2009 4:56 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Dhivya

Hi,
thanks a million...
I had this issue for the last 2 days and have screwed up..
this solution helped me lot..
once again thank you so much

Posted @ 7/27/2009 12:37 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Tatoba

Hi
Thanks a lot
Great script

Posted @ 8/5/2009 11:18 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Gilda

It works perfectly. Nowadays you could need to change the tag in:
<pages>
<controls>
<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</controls>
</pages>

Posted @ 8/18/2009 9:02 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Esther

Thank YOU! Works perfectly...would've taken me days to figure this one out myself

Posted @ 9/16/2009 12:54 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Yeny

Thank YOU!

Posted @ 9/19/2009 5:18 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Omar Diaz

I didn't get it to work, and I'm guessing that it's because I have the ajax 2005 version, I think the version pair-name its the problem... what do you think?

Posted @ 10/5/2009 11:57 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

dev_interview

Thanks. That saved me at least an hour...

Posted @ 10/12/2009 8:23 AM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

Harish Vajja

My heartly thnaks to you dude. you made my day.

Posted @ 10/15/2009 11:28 AM

# DAVETİYECİ

DAVETİYE

güzel davetiye sözleri ve davetiye metinleri

Posted @ 10/30/2009 7:49 PM

# re: AJAX: Unknown server tag 'asp:ScriptManager'.

techincal_interview

This fixed the problem on my machine. But, the interesting thing is the same code works fine on another machine which does not have the section you mentioned above.

Posted @ 11/1/2009 4:26 PM