net下如何将EXCEL导入到oracle中

开发环境 VS2008+NET3.5+ORACLE10G
数据库中表设计
CREATE TABLE CCOP (
A CHAR(20) NULL,
B CHAR(20) NULL,
C CHAR(20) NULL,
D CHAR(20) NULL
)
EXCEL的第一行前四列列名为 A B C D
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.OracleClient;
using System.Data.OleDb;
public partial class TestExcel : System.Web.UI.Page
{
    CommonClass com = new CommonClass();
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    public DataSet ExecleDs(string filenameurl,string table)
    {            
        string strConn = "Provider=Microsoft.Jet.OleDb.4.0;" + "data source=" +filenameurl+ "";
        //Extended Properties='Excel 8.0; HDR=YES; IMEX=1'";
        string connStr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Extended Properties=\"Excel 8.0;IMEX=1\";" + "data source=" + filenameurl;
        OleDbConnection conn = new OleDbConnection(connStr);
        OleDbDataAdapter odda = new OleDbDataAdapter("select * from [Sheet1$]",conn);
        DataSet ds = new DataSet();           
        odda.Fill(ds,table);               
        return ds;         
  &n