asp.net bind drop down list

@Html.DropDownListFor(x => x.itmunit, new List<SelectListItem>

    {

                        new SelectListItem() {Text = "Piece", Value="Piece"},

                        new SelectListItem() {Text = "Box", Value="Box"},

                        new SelectListItem() {Text = "Kg", Value="Kg"},

                        new SelectListItem() {Text = "Litre", Value="Litre"}

    }, new { @class = "form-control" })