dorpdownlist 新增操作

Question

是这个吗？
http://www.cnblogs.com/insus/archive/2011/11/08/2241255.html如果不是：
http://www.cnblogs.com/insus/archive/2011/11/17/2252372.html

Answer 1

绑定之前插入一行，dorpdownlist.Items.Insert(0, new ListItem("---", "-1"));

Answer 2

绑定之前插入一行，dorpdownlist.Items.Insert(0, new ListItem("---", "-1")); 正解 

Answer 3

      protected void dorpListDate() 
        {
            string sql = "select NAME from MENUS order by paixu asc ";
            DataSet drv;
            DbHelper db2 = new DbHelper();
            using (DbCommand cmd2 = db2.GetSqlStringCommond(sql))
            {
                drv = db2.ExecuteDataSet(cmd2);
            }
            fCanDan.Items.Insert(0, new ListItem("-choose--", "-1"));
            fCanDan.DataSource = drv;
            fCanDan.DataTextField = "NAME";
            fCanDan.DataBind();
        }

Answer 4

 protected void dorpListDate() 
        {
            string sql = "select NAME from MENUS order by paixu asc ";
            DataSet drv;
            DbHelper db2 = new DbHelper();
            using (DbCommand cmd2 = db2.GetSqlStringCommond(sql))
            {
                drv = db2.ExecuteDataSet(cmd2);
            }
           
            fCanDan.DataSource = drv;
            fCanDan.DataTextField = "NAME";
            fCanDan.DataBind();
//放下面，先绑再添加
 fCanDan.Items.Insert(0, new ListItem("-choose--", "-1"));
        }

Answer 5

           

先.Clear();