Help with MVC3 Html.DropDownListFor

I need some help with how to use the Html.DropDownListFor in MVC3 since the documentation is just crazy bad and I'm not finding the answer I need on here.

I have the following models

public class Users
{
     public virtual User_Roles RoleID {get; set;}
     public virtual string UserName{get; set;}
     ... more stuff
}

public class User_Roles
{
    public virtual Int32 RoleID {get; set;}
    public virtual string Role {get; set;}
}

My page (create_user.cshtml) looks like this:

@model Users
... stuff
@Html.LabelFor(m => m.RoleID)
@Html.DropDownListFor(m => m.RoleID, Model.RoleID.Role, Model.RoleID.RoleID)

It keeps throwing the error "'System.Web.Mvc.HtmlHelper<Users>' does not contain a definition for 'DropDownListFor'"

Can anyone explain to me how I can pull the list of role names开发者_如何学Go and IDs from the DB since this clearly is not the way to do it?

You need to pass items of dropdown using SelectList.

Make sure you retrieve Roles in ViewBag.Roles from controller.

@Html.DropDownListFor(m => m.RoleId, new SelectList(ViewBag.Roles as System.Collections.IEnumerable, "Id", "Name"), "")