Select a default value in dropdownlist in MVC 5

Select a default value in dropdownlist in MVC 5

@{

    var TimeZone = new List<SelectListItem>();

    foreach (var item in ViewBag.TimeZoneOffset)

    {

        TimeZone.Add(new SelectListItem() { Text = item.TimeZone, Value = item. TimeZoneID, Selected = item.TimeZoneOffset== @Model.TimeZoneOffset ? true : false });

    }

    @Html.DropDownList("TimeZoneID", TimeZone, new { id = "TimeZoneID")

}