title: Ajax htmlEditorExtender - Unrecognized element sanitizer
body: <p>Hi I've downloaded the latest version of the Ajax Toolkit from Microsoft and I'm trying to setup the sanitizer for the htmlEditorExtender, but I keep getting the following error when trying to build the site:</p>
  
  <blockquote>
    <p>"Unrecognized element 'sanitizer.'"</p>
  </blockquote>
  
  <p>Following the guide on the Ajax site I've tried to add the following:</p>
  
  <pre><code>&lt;compilation debug="true" strict="false" explicit="true" targetFramework="4.0"&gt;
    &lt;sanitizer defaultProvider="AntiXssSanitizerProvider"&gt;
      &lt;providers&gt;
        &lt;add name="AntiXssSanitizerProvider"
             type="AjaxControlToolkit.Sanitizer.AntiXssSanitizerProvider"&gt;&lt;/add&gt;
      &lt;/providers&gt;
    &lt;/sanitizer&gt;
    &lt;assemblies&gt;
      &lt;add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/&gt;
      &lt;add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
      &lt;add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/&gt;
    &lt;/assemblies&gt;
  &lt;/compilation&gt;
  </code></pre>
  
  <p>To my web.config along with:</p>
  
  <pre><code>&lt;sectionGroup name="system.web"&gt;
    &lt;section name="sanitizer"
        requirePermission="false"
        type="AjaxControlToolkit.Sanitizer.ProviderSanitizerSection, 
      AjaxControlToolkit"/&gt;
  &lt;/sectionGroup&gt;  
  </code></pre>
  
  <p>I'm quite new to ASP.net and VB.net and I've never used the Ajax toolkit before. In my Bin folder I have the AjaxControlToolkit.dll which was installed when following the instructions to add the toolkit controls to the Toolbox.</p>
  
  <p>Is there something that I'm missing or need to do to allow this to all work correctly?</p>