Populate dll in mvc2

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MVC2

I have 2 classes Book & designation in model folder

Here i am inherting Designation class in book

namespace MvcApplication2.Models{
public class Book
{
public int SelectedDESIGNATION_ID { get; set; }

[Required]
[StringLength(5,ErrorMessage="Length Exceeding")]
public string NAME { get; set; }

public List<designation> Designation { get; set; }

// public List<SelectListItem> Designation { set; get; }
// public int SelectedCity { set; get; }
}
}

namespace MvcApplication2.Models
{
public class Designation
{
public int DESIGNATION_ID { get; set; }
public string DESIGNATION_NAME { get; set; }
}
}

My controller-

public ActionResult BookDetails()<br />
       {<br />
           Book book = new Book();<br />
           book.NAME = "alpa";<br />
           //book.Designation = new List<SelectListItem>();<br />
           book.Designation = new List<Designation>();<br />
         //book.Designation = GetDesignation();<br />
           book.Designation = GetDesignation();<br />
         //ViewData["book.Designation.DESIGNATION_NAME"] = GetDesignation();<br />
           return View(book);<br />
       }

 private List<Designation> GetDesignation()<br />
        {<br />
            List<Designation> DList = new List<Models.Designation>();<br />
            Designation des = new Designation();<br />
            des.DESIGNATION_NAME = "dcos";<br />
            des.DESIGNATION_ID = 1;<br />
<br />
            des = new Designation();<br />
            des.DESIGNATION_ID = 2;<br />
            des.DESIGNATION_NAME = "jen";<br />
            DList.Add(des);<br />
            return DList;<br />
        }<br />

My View-

<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<MvcApplication2.Models.Book>" %><br />
<br />
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"><br />
	BookDetails<br />
</asp:Content><br />
<br />
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"><br />
<br />
    <h2>BookDetails</h2><br />
    <br />
    <% using (Html.BeginForm()) { %><br />
        <%: Html.LabelFor(m => m.NAME) %><br />
         <div class="editor-field"><br />
                    <%: Html.TextBoxFor(m => m.NAME) %><br />
                    <%: Html.ValidationMessageFor(m => m.NAME) %><br />
                </div><br />
         <%: Html.LabelFor(m => m.Designation) %><br />
         <div><br />
      <%: Html.DropDownList("Designation", new SelectList(Model.Designation, "DESIGNATION_ID", "DESIGNATION_NAME",""))%><br />
<br />
    </div><br />
<br />
<br />
        <div><br />
         <input type="submit" value="Book" /><br />
        </div><br />
            <% } %><br />
</asp:Content><br />

Till here My dll is populating But I want to get value of selected DLL VALUE IN CONTROLLER on clicking of button

[HttpPost]<br />
        public ActionResult BookDetails(Book model)<br />
        {<br />
            var name = model.NAME;<br />
           // var des = model.Designation.FirstOrDefault().Value;---><big>Want to get value of designation id</big>            return View(model);<br />
        }