Example of implementation of @Html.DropDownListFor

DemoController_v4.cs

 public class DemoController : Controller
    {
        public ActionResult Index()
        {
            var model = new DemoModel();
            model.Items = new List<SelectListItem>()
            {
                new SelectListItem()
                {
                    Text = "one",
                    Value = "1",
                    Selected = false
                },
                new SelectListItem()
                {
                    Text = "two",
                    Value = "2",
                    Selected = true
                }
            };
            return View(model);
        }
    }

DemoController_v5.cs

 public class DemoController : Controller
    {
        public ActionResult Index()
        {
            var model = new DemoModel();
            model.Items = new List<SelectListItem>()
            {
                new SelectListItem()
                {
                    Text = "one",
                    Value = "1"
                },
                new SelectListItem()
                {
                    Text = "two",
                    Value = "2"
                }
            };
            model.ItemValue = 2;
            return View(model);
        }
    }

DemoModel.cs

public class DemoModel
    {
        public IEnumerable<SelectListItem> Items { get; set; }
        public int ItemValue { get; set; }
    }

View_v4.cshtml

@model YourNameSpace.DemoModel

@Html.DropDownListFor(x=>x.ItemValue,Model.Items)

View_v5.cshtml

@model YourNameSpace.DemoModel

@Html.DropDownListFor(x=>x.ItemValue, new SelectList(Model.Items,"Value","Text"))