Syntax:
@Html.DropDownList(<drodownlist name="">, IEnumerable Selectlist, html Attribute) </drodownlist>
Ex:-
@Html.DropDownList("lstGroupName", ViewBag.GroupName as MultiSelectList, new { @class = "groupDropdownlist" })
In these I am bind a list into that views controller & assign it to to the viewbag "GroupName".
In these if you have any question, Please let me know.