ACCESS dropdownlist 邦定数据

public partial class _Default : System.Web.UI.Page
{
    private System.Data.OleDb.OleDbConnection  nwindConn;
    string StrCon = ConfigurationManager.ConnectionStrings["tmpdb"].ToString();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            nwindConn = new OleDbConnection(StrCon);
            nwindConn.Open();

            string StrSql = "select * from tb ";
            //SqlDataAdapter  CMD = new SqlDataAdapter(StrSql, nwindConn);
            OleDbDataAdapter CMD = new OleDbDataAdapter(StrSql, nwindConn);
            //连接数据库
            DataSet ds = new DataSet();
            CMD.Fill(ds, "table1");
            nwindConn.Close();

            DropDownList1.DataSource = ds.Tables["table1"].DefaultView;
            DropDownList1.DataValueField = "ID";
            DropDownList1.DataTextField = "Name";
            DropDownList1.DataBind();
        }
    }