在创建模式MVC 4中填充DropDownList中的数据

我正在尝试使用MVC4从DropDownList中的表填充数据.试图弄清楚如何在编辑模式下将所有语言的标题放入DropDown.

楷模:

public class CategoryLanguage
    {
        public int ID { get; set; }
        public int LanguageID { get; set; }
        public string Title { get; set; }
        public string Description { get; set; }
    }

public class Language
    {
        public int ID { get; set; }
        public string Title { get; set; }
    }

控制器:

public ActionResult Create()
        {
            using (MyDBContext db = new MyDBContext())
            {
                ViewBag.ID = new SelectList(db.Languages, "ID", "Title");
                return View();
            }
        }

        //
        // POST: /Emp/Create

        [HttpPost]
        public ActionResult Create(CategoryLanguage newCatLang)
        {
            using (MyDBContext db = new MyDBContext())
            {
                if (ModelState.IsValid)
                {
                    db.CategoryLanguages.Add(newCatLang);
                    db.SaveChanges();
                    return RedirectToAction("Index");
                }

                ViewBag.ID = new SelectList(db.Languages, "ID", "Title", newCatLang.LanguageID);
                return View(newCatLang);
            }
        }

视图:

@model MultilanguageCategories.CORE.Models.CategoryLanguage

@{
    ViewBag.Title = "Create";
}

Add New Item

@using (Html.BeginForm())
{
        @Html.ValidationSummary(true)

        @Html.DropDownList("ID", "--Select--")
}

试图弄清楚如何在创建新的CategoryLanguage实体时将所有语言的标题放入DropDown.错误说:"由于已经处理了DbContext,因此无法完成操作." 这行标记为:@ Html.DropDownList("ID"," - Select--")