相关疑难解决方法(0)

嗨,我使用Linq到SQl绑定组合框控件.如何在组合框列表的顶部添加项？

var items = from c in db.Contacts
                               orderby c.Name ascending
                               select c;
                if (items.ToList().Count > 0)
                {
                    cmb1.BindingContext = new BindingContext();
                    cmb1.DataSource = items;
                    cmb1.DisplayMember = "Name";
                    cmb1.ValueMember = "ID";
                }

                cmb1.Items.Insert(0, "--Select--");

上面的代码失败了.