title: System.web.mvc.modelstatedictionary does not contain a definition for addruleviolations
body: <p>I am getting two errors when trying to build NerdDinner in DinnerController.cs. Here is what I currently have in DinnerController.cs. I am getting errors on the two lines with '**'</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web; 
  using System.Web.Mvc;
  using NerdDinner.Models;
  
  
  
  namespace NerdDinner.Controllers
  {
  public class DinnersController : Controller
  {
      DinnerRepository dinnerRepository = new DinnerRepository();
  
      //
      // GET: /Dinners/
      public ActionResult Index()
      {
  
          var dinners = dinnerRepository.FindUpcomingDinners().ToList();
          return View(dinners);
      }
  
      //
      // GET: /Dinners/Details/2
  
      public ActionResult Details(int id)
      {
  
          Dinner dinner = dinnerRepository.GetDinner(id);
  
          if (dinner == null)
              return View("NotFound");
          else
              return View(dinner);
      }
  
      //
      // GET: /Dinners/Edit/2
  
      public ActionResult Edit(int id)
      {
  
          Dinner dinner = dinnerRepository.GetDinner(id);
          return View(dinner);
      }
  
      //
      // POST: /Dinners/Edit/2
  
      [AcceptVerbs(HttpVerbs.Post)]
      public ActionResult Edit(int id, FormCollection formValues)
      {
  
          Dinner dinner = dinnerRepository.GetDinner(id);
  
          try
          {
              UpdateModel(dinner);
  
              dinnerRepository.Save();
  
              return RedirectToAction("Details", new { id = dinner.DinnerID });
          }
          catch
          {
              **ModelState.AddRuleViolations(dinner.GetRuleViolations());
  
              return View(dinner);
          }
      }
  
      //
      // GET: /Dinners/Create
  
      public ActionResult Create()
      {
  
          Dinner dinner = new Dinner()
          {
              EventDate = DateTime.Now.AddDays(7)
          };
          return View(dinner);
      }
  
      //
      // POST: /Dinners/Create
  
      [AcceptVerbs(HttpVerbs.Post)]
      public ActionResult Create(Dinner dinner)
      {
  
          if (ModelState.IsValid)
          {
  
              try
              {
                  dinner.HostedBy = "SomeUser";
  
                  dinnerRepository.Add(dinner);
                  dinnerRepository.Save();
  
                  return RedirectToAction("Details", new { id = dinner.DinnerID });
              }
              catch
              {
                  ** ModelState.AddRuleViolations(dinner.GetRuleViolations());
              }
          }
  
          return View(dinner);
      }
  
      //
      // HTTP GET: /Dinners/Delete/1
  
      public ActionResult Delete(int id)
      {
  
          Dinner dinner = dinnerRepository.GetDinner(id);
  
          if (dinner == null)
              return View("NotFound");
          else
              return View(dinner);
      }
  
      //
      // HTTP POST: /Dinners/Delete/1
  
      [AcceptVerbs(HttpVerbs.Post)]
      public ActionResult Delete(int id, string confirmButton)
      {
  
          Dinner dinner = dinnerRepository.GetDinner(id);
  
          if (dinner == null)
              return View("NotFound");
  
          dinnerRepository.Delete(dinner);
          dinnerRepository.Save();
  
          return View("Deleted");
      }
  }
  }
  </code></pre>
  
  <p>Any help is greatly appreciated.</p>