using System.ComponentModel.DataAnnotations;
using EPiServer.Core;
using EPiServer.DataAbstraction;
using EPiServer.DataAnnotations;
 
namespace Episerver10.Models.Pages
{
    [ContentType(DisplayName = "ArticlePage", GUID = "a8fe8485-587d-4880-b485-a52430ea55de",
        Description = "Basic page type for creating apple articles.")]
    public class ApplePage : PageData
    {
        [CultureSpecific]
        [Display(
            Name = "Main body",
            Description = "The main body editor area lets you insert text and images into a page.",
            GroupName = SystemTabNames.Content,
            Order = 10)]
        public virtual XhtmlString MainBody { get; set; }
    }
}

------------ ApplePageController.cs ------------

using System.Web.Mvc;
using Episerver10.Models.Pages;
using EPiServer.Framework.DataAnnotations;
using EPiServer.Web.Mvc;
 
namespace Episerver10.Controllers
{
    [TemplateDescriptor(Default = true)]
    public class ApplePageController : PageController<>ApplePage>
    {
        public ActionResult Index(ApplePage page)
        {
            return View(page);
        }
    }
}

------------ Index.cshtml ------------

@model Episerver10.Models.Pages.ApplePage
 
@{
    Layout = null;
}
 
<>h1>@Html.PropertyFor(m => m.MainBody)h1>

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What am I missing here?

Thanks in advance for your help.