title: Extracting max value in GridView column in a Web Performance Test
body: <p>This pertains to .NET Web Performance Tests.</p>
  
  <p>If I have an ASP.NET page with a GridView that has a column of <code>int</code>s, how do I write an extraction rule to get the largest <code>int</code> in the column?</p>
  
  <p>I tried creating a custom extraction rule by inheriting from <code>ExtractionRule</code> and in the <code>Extract</code> method using <code>e.Response.HtmlDocument.GetFilteredHtmlTags</code> however, the <code>HtmlTag</code>s returned don't seem to expose their <code>innerHtml</code> contents.</p>