如何将sharepoint列表中choice类型的值绑定到dropdownlist上

  using (SPSite site=new SPSite(siteurl))
            {
                using(SPWeb web=site.OpenWeb())
                {
                    try
                    {
                        SPList list = web.Lists["ServiecesInfo"];
                        SPFieldChoice spcustomerlocation = new SPFieldChoice(list.Fields, "CustomerLocation");
                         for (int i = 0; i < spcustomerlocation.Choices.Count; i++)
                        {
                            ddlCustomLocation.Items.Add(new ListItem(spcustomerlocation.Choices[i].ToString(), i.ToString()));
                        }             
                    }
                    catch (Exception ex)
                    {
                        throw new Exception(ex.Message);
                    }
                }
            }