下拉菜单绑定，再添加一个选项“请选择”

下拉菜单绑定，再添加一个选项“请选择”

        DataSet ds = new DataSet();
        string Sql = "sp_Lyxt_Member_Country @p0";
        object[] obj = new object[1] ...{ 1 };
        ds = DataAccess.DataAccess.GetDataSet(CommandType.StoredProcedure, Sql, obj);
        this.drdl_Country.DataSource = ds;
        this.drdl_Country.DataTextField = "Member_Country";
        this.drdl_Country.DataValueField = "Member_Country";
        this.drdl_Country.DataBind();
        this.drdl_Country.Items.Add(new ListItem("请选择国籍", "000000000"));
        this.drdl_Country.SelectedValue = "000000000";