Dropdownlist与数据库绑定

1、Dropdownlist与数据库绑定。

string sql_subject="select subject from tt_subject";
            OleDbConnection Conn=db.okConn();
            Conn.Open();
            OleDbCommand cmd = new OleDbCommand(sql_subject, Conn); //这里从数据库中读入到Dropdownlist
            OleDbDataReader reader = cmd.ExecuteReader();
            Dropdownlist9.DataSource = reader;
            Dropdownlist9 .DataTextField ="subject";//字段
            Dropdownlist9.DataValueField = "subject";
            Dropdownlist9 .DataBind ();