'ASP.default_aspx' does not contain a definition for 'DS_Filtering' and no extension method
<p>I'm getting the error below after enabling <code>SqlDataSource</code> filtering event on <em>default.aspx</em>.</p>

<blockquote>
  <p>'ASP.default_aspx' does not contain a
  definition for 'DS_Filtering' and no
  extension method</p>
</blockquote>

<p>Am i missing anything? </p>

<p>Please help</p>
