Unrecognized tag prefix or device filter (Visual Studio 2010) RSS

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  KhD

  Member

  97 Points

  42 Posts

  Unrecognized tag prefix or device filter (Visual Studio 2010)

  Feb 27, 2012 02:30 AM|LINK

  <div class="post-text" itemprop="description">

  I am trying my hands on Visual Studio 2010 (Asp.Net 4.0) for the first time. I want to use Ajax controls, mainly ComboBox control.

  I followed the step-by-step procedure mentioned in this link to download and install AjavControlToolkit.

  I also followed this link for steps to add ComboBox to my webpage.

  But no matter what I do, there is a green line under the control and I'm getting the error "Unrecognized tag prefix or device filter 'ajax'".

  My web.config file looks like this:

  <configuration>
         <system.web>
      <pages>
          <controls>
              <add tagPrefix="ajax" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit"/>
              <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
              <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
          </controls>
      </pages>
      <compilation debug="true" targetFramework="4.0">
          <assemblies>
              <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
              <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
              <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies></compilation>
    </system.web>
      </configuration>

  The aspx page looks like this:

       <form id="form1" runat="server">
         <div>
          <asp:ScriptManager ID="sm" runat="server"></asp:ScriptManager>
          <ajax:ComboBox runat="server" AutoCompleteMode="SuggestAppend">
            <asp:ListItem>ddd</asp:ListItem>
            <asp:ListItem>fff</asp:ListItem>
            <asp:ListItem>gggg</asp:ListItem>
            <asp:ListItem>hhhhh</asp:ListItem>
          </ajax:ComboBox>    
         </div>
      </form>
  

  I have even tried deleting the schema files from C:\Documents and Settings\xxx\Application Data\Microsoft\VisualStudio\10.0\ReflectedSchemas location.

  Please help me in successfully implementing the Combobox control. Thanks!

  Edited:

  As a different approach, I created a new website and installed the latest version of AjaxControlToolkit using NuGet. I rebuilt the solution. I still could not see the Ajax controls in intellisense. Is there anything else that needs to be done to implement it? Please help!!

  </div>
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  Usha82

  Member

  710 Points

  129 Posts

  Re: Unrecognized tag prefix or device filter (Visual Studio 2010)

  Feb 27, 2012 03:16 AM|LINK

  Just to confirm did u add reference to dll file? Try registering the control in page instead of doing it in Web. config.

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  KhD

  Member

  97 Points

  42 Posts

  Re: Unrecognized tag prefix or device filter (Visual Studio 2010)

  Feb 28, 2012 02:07 AM|LINK

  I have already tried that. It is not working.

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  chetan.sarod...

  All-Star

  65789 Points

  11153 Posts

  Re: Unrecognized tag prefix or device filter (Visual Studio 2010)

  Feb 28, 2012 02:14 AM|LINK

  Hi, Please refer this

  http://blogs.msdn.com/b/mikhailarkhipov/archive/2005/04/21/410557.aspx

  http://forums.asp.net/p/1590771/4030810.aspx

  http://forums.asp.net/t/1137121.aspx/1

  http://forums.asp.net/t/1304637.aspx/1

  Chetan Sarode
  Senior Software Engineer,
  Approva Systems Pvt Ltd, Pune, India.
  
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  KhD

  Member

  97 Points

  42 Posts

  Re: Unrecognized tag prefix or device filter (Visual Studio 2010)

  Feb 28, 2012 03:44 AM|LINK

  Thank you for the links Chetan. I've seen them all and tried every solution.

  I have tried:

  --adding reference to the dll manually.

  --registering the assembly on the page, and/or in web.config

  --adding controls in toolbox and dragging and dropping to the page (which automatically registers the dll)

  --deleting schema files and restarting VS2010.

  --downloading AjaxControlToolkit using NuGet.

  Nothing seems to be working. I simply cannot get the controls to work.

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  Song-Tian - ...

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  Microsoft

  Re: Unrecognized tag prefix or device filter (Visual Studio 2010)

  Feb 28, 2012 06:55 AM|LINK

  Hi,

  Please send the sample project to me. And I will check that. My email: support-sotian@live.com

  Please mark the replies as answers if they help or unmark if not.
  Feedback to us
  
  Develop and promote your apps in Windows Store
  
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  KhD

  Member

  97 Points

  42 Posts

  Re: Unrecognized tag prefix or device filter (Visual Studio 2010)

  Feb 28, 2012 08:32 AM|LINK

  Hi Song-Tian,

  I have emailed the sample project and details to you. Thank you so much for taking out time for this.

  Looking forward to your reply.

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  Song-Tian - ...

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  Re: Unrecognized tag prefix or device filter (Visual Studio 2010)

  Feb 28, 2012 09:16 AM|LINK

  Hi,

  I have change the project and send to you. Please check.

  Please mark the replies as answers if they help or unmark if not.
  Feedback to us
  
  Develop and promote your apps in Windows Store
  
  • Marked as answer by KhD on Feb 29, 2012 03:36 AM
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  KhD

  Member

  97 Points

  42 Posts

  Re: Unrecognized tag prefix or device filter (Visual Studio 2010)

  Feb 29, 2012 03:42 AM|LINK

  I am pasting the code for other's reference:

  <%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
      CodeFile="Default.aspx.cs" Inherits="_Default" %>
  
  <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit.HTMLEditor"
      TagPrefix="cc1" %>
  
  <asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
  </asp:Content>
  <asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
     
      <ajaxToolkit:ToolkitScriptManager runat="server">
      </ajaxToolkit:ToolkitScriptManager>
      <cc1:Editor ID="Editor1" runat="server" />
      <br />
  <br />
  <ajaxToolkit:ComboBox ID="ComboBox1" runat="server"
      AutoCompleteMode="SuggestAppend">
      <asp:ListItem>xxxx</asp:ListItem>
      <asp:ListItem>cvvv</asp:ListItem>
      <asp:ListItem>bbnbn</asp:ListItem>
      <asp:ListItem>mmn,m,,</asp:ListItem>
  </ajaxToolkit:ComboBox>
      
  </asp:Content>

  
  Web.config part is:

    <pages>
  			<controls>
  				<add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit"/>
  			</controls>
  		</pages>

  Seems like it has been working all along.
  I still get the green line under the control definition saying "Unrecognized tag prefix or device filter".
  But if I go ahead and run the page anyway, it runs ok.

  • Edited by KhD on Feb 29, 2012 03:42 AM
  • Marked as answer by KhD on Feb 29, 2012 03:43 AM