how to get drop down list in MVC 4

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using vijay_dotnet.Models;

namespace vijay_dotnet.Controllers
{
public class RoleController : Controller
{
//
// GET: /Role/

public ActionResult Role()
{
return View();
}


}
}

@model vijay_dotnet.Models.Role_Master_Model

@{
ViewBag.Title = "Role";
}

@using (Html.BeginForm()) {
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)

<table width="100%" border="1" cellspacing="2">
<tr>
<td colspan="2" ><b>Role Master</b></td>
</tr>
<tr>
<td align="right">Role Description :</td>
<td >@Html.TextBoxFor(m => m.Role_Description)</td>
</tr>

<div class="row">
<div class="col-md-3">
@Html.DisplayName("Status")
</div>
<div class="col-md-3">
@Html.DropDownListFor(model => model.Role_Id, new SelectList(Model.Status_Description, "Value", "Text"), new { @class = "form-control" })

</div>
<div class="col-md-3">
</div>
<div class="col-md-3">
</div>
<tr>
<td align="center" colspan="2">
<input type="submit" value="Save" />
</td>
</tr>

</table>
}

<div>
@Html.ActionLink("Back to List", "List")
</div>

@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace vijay_dotnet.Models
{
public class Role_Master_Model
{
public int Role_Id { get; set; }
public string Role_Description { get; set; }
public string Status { get; set; }
public IEnumerable<SelectListItem> Status_Description { get; set; }
}

}