Dropdownlist is not working on my asp.net mvc?

Question

Hi Team

 

I am trying to use this control on asp.net mvc, its throwing this error " System.InvalidOperationException: 'There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'SelectedCountryId'.'

 

@Html.DropDownListFor(m=>m.SelectedCountryId, this.ViewBag.CountryList as SelectList, new {@class = "form-control"})

/** Controler**/

// Selection for countries in the world.

        public ActionResult DropDownSelect()
        {
            EditTrainingRegFormViewModel model = new EditTrainingRegFormViewModel();

            model.SelectedCountryId = 0;

            this.ViewBag.CountryList = this.GetCountryList();
            return this. View(model);
        }


     private List<EditTrainingRegFormViewModel> LoadData()
        {
            List<EditTrainingRegFormViewModel> lst = new List<EditTrainingRegFormViewModel>();

            try
            {
                string line = string.Empty;
                string srcFilePath = "Content/files/country_list.txt";
                var rootPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
                var fullPath = Path.Combine(rootPath, srcFilePath);
                string filePath =  new Uri(fullPath).LocalPath;
                StreamReader src = new StreamReader(new FileStream(filePath, FileMode.Open, FileAccess.Read));

                // while to read the file
                while((line = src.ReadLine()) !=null) {
                  EditTrainingRegFormViewModel infoLst = new EditTrainingRegFormViewModel();
                    string[] info = line.Split(',');

                    //Setting
                    infoLst.Country_Id = Convert.ToInt32(info[0].ToString());
                    infoLst.Country_Name = info[1].ToString();

                    lst.Add(infoLst);
                }
                src.Dispose();
                src.Close();
            }catch(Exception ex)
            {
                Console.Write(ex);
            }
            return lst;
        }
  // List for countries.
        private IEnumerable<SelectListItem> GetCountryList()
        {
            SelectList listcn = null;
            try
            {
                var list = this.LoadData().Select(p => new SelectListItem
                {
                    Value = p.Country_Id.ToString(),
                    Text = p.Country_Name
                });
                listcn = new SelectList(list, "Value", "Text");

            }catch(Exception ex)
            {
               // throw ex;
            }
            return listcn;
        }

// Model.cs
 public class EditTrainingRegFormViewModel
    {
        public string Title { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public string Position { get; set; }

        public string Company { get; set; }

        public string Address { get; set; }

        [Display(Name = "Choose country")]
        public int ? SelectedCountryId { get; set; }

        public string Code { get; set; }

        public string City { get; set; }

        public string State { get; set; }

        public string Cell_Number { get; set; }

        public List<string> Dietary_requirement { get; set; }

        public string Email { get; set; }

        public int Country_Id { get; set; }

        public string Country_Name { get; set; }


    }