(C#)DropDownList绑定数据库数据后再插入项的代码

(C#)DropDownList绑定数据库数据后再插入项的代码

    sql="select distinct(acayear) acy from stuadmin.coursemean";
    dr=config.read(sql,config.constr);
    acayear.DataSource=dr;
    acayear.DataTextField="acy";
    acayear.DataValueField="acy";
    acayear.DataBind();
    acayear.Items.Insert(0,new ListItem("---------",""));//这就是加入的那句代码（内容，值）

 

libs.Database.Dbbase dsbb = new libs.Database.Dbbase();
            this.DropDownList5.DataSource = dsbb.SelectSubject();
            this.DropDownList5.DataTextField = "subject_title";
            this.DropDownList5.DataValueField = "id";
            this.DropDownList5.DataBind();
            this.DropDownList5.Items.Insert(0,new ListItem("无专题名称","0"));