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mvc3 partial view error
public PartialViewResult GetStates()
        {
            var states = from s in conn.order_data select s.state;
            return PartialView(states.ToList());
        }

@model IEnumerable<bookstore.state>

@foreach (var item in Model) {

    <select>
    <option>@item.STATE_Name</option>
    </select>
}

<div class="editor-field">
    @{Html.RenderPartial("GetStates");}
 </div>

public ActionMethod MainView()
{
  var model = new myMainModel { States = from s in conn.order_data select s.state };
  return View()
}

@Html.Partial("MyPartialViewName", Model.States);

if(states != null)
{
  return PartialView(states.ToList());
}

return PartialView();