title: ASP.NET => Compiler Error Message: CS0246: The type or namespace name 'HtmlAgilityPack'
body: <pre><code>using HtmlAgilityPack;
  </code></pre>
  
  <p>// reference it</p>
  
  <p>Produces error: ASP.NET => Compiler Error Message: CS0246: The type or namespace name 'HtmlAgilityPack' ...</p>
  
  <p>HtmlAgilityPack IS referenced in my web site.</p>
  
  <p>Switched from ASP.NET 2.0 to 4.0. After that, got this error. When making a console or windows forms application, all is fine, but ASP.NET build system gives me this error. I have this compile error when using HtmlAgilityPack.</p>
  
  <p>No luck till today fixing this.</p>