Dropdownlist, populate data from database

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C#5.0

EF6.0

HI everybody,

I try to populate the data from database in a dropdownlist, like this:

ViewModel:

public class ClimbViewModel
    {
        public int Id { get; set; }

        [Required(ErrorMessage="You need to give it a name")]
        public string Name { get; set; }
        private readonly List<Country> _Country;

        public int SelectedValue { get; set; }
        public virtual Country  country { get; set; }

        public int SelectedCountryId { get; set; }
       
        public IEnumerable<SelectListItem> CountryItems
        {
            get { return new SelectList(_Country, "Id", "country_name"); }
        }

        [DisplayName("Country")]
        public virtual ICollection<Country> Countries { get; set; }

    }
}

Action method:

[HttpPost]
        //[ValidateAntiForgeryToken]
        public ActionResult Create(Climb ModelViewClimb)
        {
            //var CountryName = db.countries.Select .GetProductCategory(productViewModel.SelectedValue);
            try
            {
                if (ModelState.IsValid)
                {
                    //Climb climbModel = db.Climbs.Where(x => x.climbID == climb.Id).First();
                    //db.Entry(climb).State = EntityState.Modified;
                    db.Climbs.Add(ModelViewClimb);
                    
                    
                    db.SaveChanges();
                    return RedirectToAction("Index");
                }
            }
            catch (RetryLimitExceededException /* dex */)
            {
               
                ModelState.AddModelError("", "Unable to save changes. Try again, and if the problem persists, see your system administrator.");
            }
          
            ViewBag.CountryID = new SelectList(db.countries, "CountryID", "Name", ModelViewClimb.CountryID);
            return View(new ClimbViewModel() );
        }

and the view:

<div class="form-group">
           <label class="control-label col-md-2" for="CountryID">Country</label>
           <div class="col-md-10">
               @Html.DropDownListFor(model => model.country.country_name, (SelectList)ViewBag.CountryID))
               @Html.ValidationMessageFor(model => model.Id)
           </div>
       </div>

But every time I get this error:

There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'country.country_name'.

Thank you