asp.net cshtml can't run asp.net code

I'm following the tutorial at asp.net mvc3 at http://www.asp.net/mvc/tutorials/getting-started-with-mvc3-part3-cs

@{
    ViewBag.Title = "Welcome";
}

<h2>Welcome</h2>

<ul> 
   @for (int i=0; i < ViewBag.NumTimes; i++) { 
      <li>@ViewBag.Message</li> 
   } 
</ul>

the hellowWorldcontroller

using System.Web;
using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    public class HelloWorldController : Controller
    {
        // GET: /HelloWorld/ 

        /*public void Index()
        {
            //return "This is my <b>default</b> action...";
            return View;
        }*/
        public ActionResult Index()
        {
            //ViewBag.Message = "Welcome to ASP.NET MVC!";


            return View();
        }

        // 
        // GET: /HelloWorld/Welcome/ 

        public ActionResult Welcome(string name, int numTimes = 1)
        {
            return View();
            //return HttpUtility.HtmlEncode("Hello " + name + ", NumTimes is: " + numTimes);
        }
    }
}

But it seems that in cshtml, it can't run the asp.net code, only display the static content, why?

And the cshtml also don't apply to the MainContent master page, t开发者_高级运维here is only plain text without any background and button when I run the application, where's the problems?

---

To have your for to work, you must set the value of ViewBag in the controller.

Change the the controller like this

public ActionResult Welcome(string name, int numTimes = 1)
{
    ViewBag.Message = name;
    ViewBag.NumTimes = numTimes;
    return View();
}