EditorFor in MVC

Models->Supplier:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel;

namespace FeaturesOfMVC2.Models
{
    [MetadataType(typeof(Supplier_Validation))]
    public partial class Supplier
    {
        class Supplier_Validation
        {
            [ScaffoldColumn(false)]
            [DisplayName("Supplier Id :")]
            public int SupplierId { get; set; }

            [Required(ErrorMessage = "Name Required!")]
            [DisplayName("Supplier Name :")]
            public string SupplierName { get; set; }

            [UIHint("StateDDL")]
            [DisplayName("State :")]
            public int StateId { get; set; }

            [UIHint("CityDDL")]
            [DisplayName("City :")]
            public int CityId { get; set; }

            [UIHint("EmailAddress")]
            [DisplayName("Email Address :")]
            public string EmailId { get; set; }
        }
    }
}

Views->Shared->EditorTemplates->StateDDL.ascx

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<%= Html.DropDownList("", new SelectList(ViewData["States"] as IEnumerable, "Id", "Name", Model))%>

Views->Shared->EditorTemplates->CityDDL.ascx

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<%= Html.DropDownList("", new SelectList(ViewData["Cities"] as IEnumerable, "Id", "Name", Model))%>

Views->Supplier->Edit.aspx

<%= Html.EditorFor(model => model.StateID) %>
<%= Html.EditorFor(model => model.CityID) %>