droplist应用实例

  设置选中与隐藏某项

  private void SetSelectedItem(System.Web.UI.WebControls.DropDownList list, string selectparam)
    {
        string sql_select;
        sql_select = "select  * from type_news where parentid=0 ";
        DataSet ds = DBHelper.Valueset(sql_select);
        list.DataSource=ds.Tables[0];
        //list.Items.Remove("--新建类别--");
        //list.Items.Insert(0, new ListItem("------", "-1"));
        list.DataTextField = "typename";
        list.DataValueField = "typeid";
        list.DataBind();
        foreach (ListItem e in list.Items)
        {
            //ListItem item = list.Items.FindByValue(Nshow);
            if (e.Value.ToString() == selectparam)
            {
                e.Selected = true;
                return;
            }
            else e.Selected = false;
        }
    }