how I refresh the partial view from Business logic

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ASP.NET

Ajax

jQuery

View: Index

@{
    ViewBag.Title = "Home Page"; 
}

@section Content1
{ 
    <div>  
     @Ajax.ActionLink("Just refresh", "_Test", "Home", null, new AjaxOptions() { UpdateTargetId = "ContentRefresh", HttpMethod = "Post" }, null) 
    </div>

    @Html.Partial("_Test")
}
    
@section Content2
{ 
    <div id="ContentRefresh">
       @Html.Partial("_Test2")
    </div>
}

View: _Test

@using (Ajax.BeginForm("_Test", "Home", null, new AjaxOptions(){UpdateTargetId = "ContentRefresh", HttpMethod = "Post" }, null))
    {  
        @Html.TextBox("Name"); 
        <input type="submit" value="Send name" /> 
    }

View: _Test2

@ViewBag.Name:  @ViewBag.DateTime 

Controller:

public ActionResult _Test(FormCollection form)
{
    string name = form["Name"];

    if (Request.IsAjaxRequest())
    {
         Thread thread = new Thread(() => RunThread());
         thread.Start();

        ViewBag.Name = name == null ? "No one, just refreshing" : name;
        ViewBag.DateTime = DateTime.Now.ToShortTimeString();

        return PartialView("_Test2");
    }
    else
    {
        return View();
    }
}

This event is call from business logic.

public void ChangeEventFromBusinessLogic(object o)
{
      //event from RunThread....
      //refresch my view
}

the ajax call from the view does work. how I refresh the view from Business logic without any user action.

how I do this?