DropDownList 数据绑定

 
 string strconn = System.Configuration.ConfigurationManager.AppSettings["Main.ConnectionString"].Trim() + " ; Provider=SQLOLEDB;";

        OleDbConnection cnn = new OleDbConnection(strconn);

        string sql = "select * from JackDonkey_Tag  order by TagId";

        cnn.Open();

        OleDbCommand cmd = new OleDbCommand(sql, cnn);

        DropDownList_tag1.DataSource = cmd.ExecuteReader();

        DropDownList_tag1.DataTextField = "TagName";

        DropDownList_tag1.DataValueField = "TagId";

        DropDownList_tag1.DataBind();

cnn.Close();