Populate list of model class into DropDownList in ASP.NET MVC

First we need to create the list of SelectListItem from the list of Model classes.

var list = context.Roles.OrderBy(r => r.Name).ToList().Select(rr => new SelectListItem { Value = rr.Id.ToString(), Text = rr.Name }).ToList();

            ViewBag.Roles = list;            

Then in the View, we need to unbox the ViewBag to IEnumerable<SelectListItem>

Role Name: @Html.DropDownList("RoleName", (IEnumerable<SelectListItem>)ViewBag.Roles, "Select ...")

Hope this code snippet will be useful.