I use a dropdownlist in one of my create.aspx but it some how doesnt seem to work...

public IEnumerable<Materials> FindAllMeasurements()
    {
        var mesurements = from mt in db.MeasurementTypes
                          select new Materials()
                          {
                             Id= Convert.ToInt64(mt.Id),
                             Mes_Name= mt.Name
                          };
        return mesurements;
    }

and my controller,

public ActionResult Create()
{
 var mesurementTypes = consRepository.FindAllMeasurements().AsEnumerable();
 ViewData["MeasurementType"] = new SelectList(mesurementTypes, "Id", "Mes_Name");
 return View();
} 

and my create.aspx has this,

<p>
  <label for="MeasurementTypeId">MeasurementType:</label>
   <%= Html.DropDownList("MeasurementType", ViewData["MeasurementType"])%>
     <%= Html.ValidationMessage("MeasurementTypeId", "*") %>
   </p>

When i execute this i got these errors,

1. System.Web.Mvc.HtmlHelper<CrMVC.Models.Material>' does not contain a definition for 'DropDownList' and the best extension method overload 'System.Web.Mvc.Html.SelectExtensions.DropDownList(System.Web.Mvc.HtmlHelper, string, System.Collections.Generic.IEnumerable<System.Web.Mvc.SelectListItem>)' has some invalid arguments

2.cannot convert from 'object' to 'System.Collections.Generic.IEnumerable<System.Web.Mvc.SelectListItem>