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Home/ Questions/Q 508307
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T06:53:37+00:00 2026-05-13T06:53:37+00:00

I am using a master page… Then there is an .aspx that uses this

  • 0

I am using a master page…

Then there is an .aspx that uses this masterpage..

what i want to use is the ajax NumericUpDownExtender but i am getting an error from the start when i put this in my masterpage

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc2" %>
<%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="asp" %>

The error message i get is

Parser Error Message: Could not load file or assembly ‘AjaxControlToolkit’ or one of its dependencies. The system cannot find the file specified.

Source Error:

Line 3:  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Line 4:  
Line 5:  <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc2" %>
Line 6:  <%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Line 7:      Namespace="System.Web.UI" TagPrefix="asp" %>

Source File: /Site1.Master Line: 5

Assembly Load Trace: The following
information can be helpful to
determine why the assembly
‘AjaxControlToolkit’ could not be
loaded.

WRN: Assembly binding logging is
turned OFF. To enable assembly bind
failure logging, set the registry
value
[HKLM\Software\Microsoft\Fusion!EnableLog]
(DWORD) to 1. Note: There is some
performance penalty associated with
assembly bind failure logging. To turn
this feature off, remove the registry
value
[HKLM\Software\Microsoft\Fusion!EnableLog].

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-13T06:53:38+00:00Added an answer on May 13, 2026 at 6:53 am

    You need to have the correct version of the AjaxControlToolkit DLL.

    And, it needs to be in your app’s bin folder (or the GAC).

    Here’s a quick explanation of how to set this up, setp by step.

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