title: Ajax.BeginForm refreshes the view instead of updating target id
body: <p>My view</p>
  
  <pre><code>&lt;div id="ValidationSummary"&gt;
       @Html.Partial("ValidationSummary")
  &lt;/div&gt;
  
  @using (Ajax.BeginForm("Index", //&lt;-- Action name
      "JobDetails", //&lt;-- Controller name
       new AjaxOptions { HttpMethod = "Post", UpdateTargetId = "ValidationSummary" }))
  {
  
  }
  </code></pre>
  
  <p>I want the ValidationSummary to replace. But it changes my url to JobDetails</p>