Multiple select Dropdown in mvc

An example to build a multiple select dropdown using a view model:
public class MyViewModel
 {
  public int[] SelectedValues { get; set; }   
  public IEnumerable Values { get; set; } 
}
that would be populatd in the controller
public ActionResult Index()
{
var model = new MyViewModel();
// preselect items with values 2 and 4
model.SelectedValues = new[] {2,4};
// the list of available values
model.Values = new[]
{
   new SelectListItem {value = "1", Text = "item 1"},
   new SelectListItem {Value = "2", Text = "item 2"},
   new SelectListItem {Value = "3", Text="item 3"};
   new SelectListItem {Value = "4",Text="item 4"};
};
return View(model);
}
and in the view:
@model MyViewModel
@Html.ListBoxFor(x=> x.SelectedValues, Model.Values)
 

Please use ListBox for mulitple select in dropdown box.

@Html.ListBoxFor(m => m.location_code, Model.location_type)

Hope it helps.

Use a ListBoxFor instead of DropDownListFor:

@Html.ListBoxFor(m => m.name, Method.getName("", Model.name), "--Select--")
@Html.ListBoxFor(m => m.department,Method.getDepartment(Model.name, Model.department), "--Select--")

The name and department properties must obviously be collections that will contain the selected values.

The HTML helper will automatically preselect the items whose values match those of the Name/Department property.