DropDown BInds With various way

========================SelectListItem=================

List<SelectListItem> items = new List<SelectListItem>();
items.Add(new SelectListItem() { Text = "Test1", Value = "1", Selected = false });
items.Add(new SelectListItem() { Text = "Test8", Value = "8", Selected = true });
items.Add(new SelectListItem() { Text = "Test3", Value = "3", Selected = false });
items.Add(new SelectListItem() { Text = "Test5", Value = "5", Selected = false });

SelectList sl = new SelectList(items, "Value", "Text", "8");

 public List Releases { get; set; }
 Model.Releases = releaseList.AsEnumerable().Select(p => new SelectListItem { Text = p.ReleaseName, Value = p.ReleaseID.ToString(), Selected = (p.ReleaseID == fltritems.WorkingReleaseId) }).ToList();