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asp.net - vb.net page doesnt recognize scriptmanager tag

I am trying to use the script manager tag to relay data from a javascript function to code behind and its not working I get this error:
Server Error in '/' Application.
--------------------------------------------------------------------------------

Parser Error 
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. 

Parser Error Message: Unknown server tag 'asp:scriptmanager'.

Source Error: 


Line 228:    </script>  
Line 229:    
Line 230:    <asp:scriptmanager ID="Scriptmanager1" runat="server" EnablePageMethods="true"></asp:scriptmanager>
Line 231:    <asp:HiddenField runat="server" ID="sessionDuration" />
Line 232:        
 

Source File: /Shoe_Comp/ShoeMobile.aspx    Line: 230 


--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.5448; ASP.NET Version:2.0.50727.5420

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GlobaLevel
Asked:
GlobaLevel
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1 Solution
 
mr_nadgerCommented:
wrong case in the script manager tag?
just a guess as I'm not next to a box I can test it on
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gery128Commented:
Check if you have Ajax Extension installed on machine
Check if you have reference to AjaxControlToolkit.DLL in bin folder
add following lines in web.config:
<pages>

      <controls>

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

      </controls>

  </pages>

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CodeCruiserCommented:
The link I posted showed you exactly the same thing.
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