跪求大侠帮忙看下这个DropDownList编辑的问题 实在是没豆了 谢谢！

Question

控制器：

int etid =int.Parse(EditID);
            A_CustomerInfoModel model = new A_CustomerInfoModel();
            List<A_CustomerInfoModel> list = base.CustomerInfo.GetModelEdit(EditID) as List<A_CustomerInfoModel>;
            if (list.Count > 0)
            {
                foreach (A_CustomerInfoModel item in list)
                {
                    List<SelectListItem> items = new List<SelectListItem>();
                    items.Add(new SelectListItem { Text = "Personal", Value = "0" });
                    items.Add(new SelectListItem { Text = "Company", Value = "1"});
                    foreach (SelectListItem item_sp in items)
                    {
                        if (item_sp.Value == item.A_CutomerType)
                        {
                            var selectList = new SelectList(items, items[0].Text, items[0].Value, item.A_CutomerType);
                            ViewData["dorplist_sp"] = selectList;
                        }
                    }

                    model.A_Customer_Name = item.A_Customer_Name;
                    model.Homepage = item.Homepage;
                    model.A_province = item.A_province;
                    model.A_city = item.A_city;
                    model.A_Customer_Address = item.A_Customer_Address;
                    model.A_Customer_Post = item.A_Customer_Post;
                    model.A_Contactperson = item.A_Contactperson;
                    model.A_Contacter_Tel = item.A_Contacter_Tel;
                    model.A_IDcardNo = item.A_IDcardNo;
                    model.A_Contacter_fax = item.A_Contacter_fax;
                    model.A_Contacter_email = item.A_Contacter_email;
                }
                return View(model);
            }
            else
            {
                //没有数据
                return View();
            }          

视图代码：

@Html.DropDownList("dorplist_sp", ViewData["dorplist_sp"] as SelectList)

我改成@Html.DropDownList("dorplist_sp")也不行

页面报错提示：

DataBinding:“System.Web.Mvc.SelectListItem”不包含名为“Personal”的属性。