Ajax.BeginForm not working asynchronously

I am using Ajax.BeginFrom in Index view to test method in Home controller

@using (Ajax.BeginForm(actionName: "TestMethod",
        controllerName: "Home",
        ajaxOptions: new AjaxOptions
        {
            HttpMethod = "POST",
            InsertionMode = InsertionMode.Replace,
            UpdateTargetId = "TestInfo",
            LoadingElementId = "Progress"
        }))
{
    <input type="submit" value="Search" />
    <div id="TestInfo"></div>
}

      

        
        
        
      

    

and

[HttpPost]
public virtual ActionResult TestMethod()
{
    return Content("ok");
}

      

        
        
        
      

    

But after submitting, redirecting the page to / Home / TestMethod and showing 'ok'.

I added

<add key="UnobtrusiveJavaScriptEnabled" value="true" />

      

        
        
        
      

    

in webconfig and

<script src="@Links.Scripts.jquery_unobtrusive_ajax_min_js" type="text/javascript"></script>

      

        
        
        
      

    

in my layout. But it still doesn't work asynchronously. Where is the problem?