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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")

}  
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