How to select existing value in DropDownListFor ?

See more:

MVC

I have written code for model is:

public ActionResult Edit(int id = 0)
       {
           StudendDetails objStudent = new StudendDetails();
           if (id == 0)
           {
               return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
           }
           else
           {
               Repository objCommmon = new Repository();

               List<SelectListItem> genderList = objCommmon.GetGenderList();
               List<SelectListItem> StatusList = objCommmon.GetStatus();

               objStudent = objConnection.Studend_Details.Where(x => x.Roll_No == id).SingleOrDefault();


               ViewBag.Gender = genderList.Select(x => x).ToList().Select(x => new SelectListItem
               {
                   Value = x.Value.ToString(),
                   Text = x.Text.ToString(),
                   Selected = (x.Value.ToString() == objStudent.Gender ? true : false)
               });



               ViewBag.Status = StatusList.Select(x => x).ToList().Select(x => new SelectListItem
                       {
                           Value = x.Value.ToString(),
                           Text = x.Text.ToString(),
                           Selected = (x.Value.ToString() == objStudent.Status ? true : false)
                       });


                   return View("StudentMain", objStudent);


               }

           }

In the view

@Html.DropDownListFor(model => model.Gender,(IEnumerable<SelectListItem>)ViewBag.Gender,  new { id = "ddlGender", style = "width: 150px;" }).


 @Html.DropDownListFor(model => model.Status, (IEnumerable<SelectListItem>)ViewBag.Status, new { id = "ddlStatus", style = "width:150px" }) 

When i retrieve existing record from model then textbox is being filled but in case of DropDownListFor Not select from exiting value .

Please help me any one.