title: Microsoft Ajax Toolkit References
body: <p>I downloaded and installed the Ajax Toolkit Microsoft provides into my copy of Visual Studio.  I'm trying to follow online examples of using the controls and I ran into the following discrepancy.  I have installed the toolkit and it's accessible through the toolbox.  I have added a reference to this particular project
  <img src="https://i.stack.imgur.com/V6oJy.png" alt="enter image description here"></p>
  
  <p>but when I drag and drop the AutoCompleteExtender control from the toolkit I see some difference ASP.  I see something like </p>
  
  <pre><code>&lt;asp:AutoCompleteExtender&gt;
  </code></pre>
  
  <p>but all of the examples that I've seen show syntax like <code>&lt;ajaxToolkit:AutoCompleteExtender&gt;</code>
  however, when I try to use that syntax I get a warning `unrecognized tag prefix or device filter 'ajaxToolkit'.<br>
  proof the ToolKit is installed </p>
  
  <p><img src="https://i.stack.imgur.com/iDLqy.png" alt="enter image description here"></p>
  
  <p>What is different here?  Intellisense doesn't pick up on the ajaxToolkit tag and even after adding a using statement for everything in the AjaxToolkit namespace I still get the warning message of the unrecognized tag.  </p>