ASP.NET MVC-3.0/ JqGrid/ Unit Of Work/ Repository/ EF 4.1 CRUD Application (N Layered)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using BLL;
using DAL;



namespace JqGridCRUD.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            ViewBag.Message = "Welcome to ASP.NET MVC!";

            return View();
        }

        public ActionResult About()
        {
            return View();
        }

        public ActionResult GridDemoData(int page, int rows, string search, string sidx, string sord)
        {

            var manageContacts = new ManageContacts();
            int currentPage = Convert.ToInt32(page) - 1;
            int totalRecords = 0;

            var data = manageContacts.GetContactPaged(currentPage, rows, out totalRecords);

            var totalPages = (int)Math.Ceiling(totalRecords / (float)rows);
            var jsonData = new
            {
                total = totalPages,
                page,
                records = totalRecords,

                rows = (
                           from m in data
                           select new
                           {
                               id = m.ContactID,
                               cell = new object[]
                                                                            {
                                                                                m.Title,
                                                                                m.FirstName,
                                                                                m.LastName
                                                                               
                                                                            }
                           }).ToArray()
            };
            return Json(jsonData, JsonRequestBehavior.AllowGet);

        }
        public ActionResult PerformCRUDAction(Contact contact)
        {
            var manageContacts = new ManageContacts();

            bool result = false;
            switch (Request.Form["oper"])
            {
                case "add":
                    contact.AddDate = DateTime.Now.Date;
                    contact.ModifiedDate = DateTime.Now;
                    result = manageContacts.AddContact(contact);
                    break;
                case "edit":
                    int id = Int32.Parse(Request.Form["id"]);
                    result = manageContacts.UpdateContact(contact,id);
                    break;
                case "del":
                    id = Int32.Parse(Request.Form["id"]);
                    result = manageContacts.DeleteContact(id);
                    break;
                default:
                    break;
            }
            return Json(result);
        }


    }

}