dropdownlist控件的使用问题(急等解决)

以下是page_load 事件中的代码
if ( ! IsPostBack)
{
schoolmate.openclos opd = new openclos();
sqlstring = "select * from article ";
opd.opendata(sqlstring);
opd.myconnect.Open();
opd.myread = opd.mycommand.ExecuteReader();
this.DataGrid1.DataSource = opd.myread;
this.DataGrid1.DataBind();
opd.myread.Close();
opd.myconnect.Close();

}