Excel导入数据库

没有提示代码错误，可为什么没导入数据呢，求解！
 protected void Button1_Click(object sender, EventArgs e)
    {
        string filePath = "";
        string getErrMsg = "";
        DataSet excelDs = new DataSet();
        if (FileUpload1.PostedFile.FileName == "")
        {
            Response.Write(" <script language=javascript>alert('请选择要上传的文件！'); </script>");
            return;
        }
        else
        {
            string name = FileUpload1.PostedFile.FileName;
            int i = name.LastIndexOf(".");
            string namelast = name.Substring(i);
            if (namelast == ".xls" || namelast == ".xlsx")
            {
                //从Excel读取数据 
                filePath = FileUpload1.PostedFile.FileName;
                string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=YES;IMEX=1'";
                /*excel 2000 ~ 2003的 OleDb 连接串的格式如下：                Provider=Microsoft.Jet.OleDb.4.0;Data Source='excel文件路径';Extended Properties='Excel 8.0;HDR=YES'                excel 2007 的 OleDb 的连接串的格式如下：                Provider=Microsoft.Ace.OleDb.12.0;Data Source='excel文件路径';Extended Properties='Excel 12.0;HDR=YES'
                */
                OleDbConnection excelConn = new OleDbConnection(connString);
                excelConn.Open();
                OleDbDataAdapter ExcelDA = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", excelConn);
                try
                {
                    ExcelDA.Fill(excelDs, "[Sheet1$]");
                }
                catch (Exception err)
                {
                    Response.Write(err.Message);
                }
                finally
                {
                    excelConn.Close();
                    excelConn = null;
                }
                if (excelDs.Tables[0].Rows.Count != 0)
                {                    for (int j = 0; j < excelDs.Tables[0].Rows.Count; j++)
                    {
                        string ResponseSQL = "";
                        int id = int.Parse(excelDs.Tables[0].Rows[j][0].ToString());
                        string teaName = excelDs.Tables[0].Rows[j][1].ToString();
                        string dept = excelDs.Tables[0].Rows[j][2].ToString();
                        //string password = excelDs.Tables[0].Rows[j]["PASSWORD"].ToString();
                        //string mobilephone = excelDs.Tables[0].Rows[j]["MOBILEPHONE"].ToString();
                        ResponseSQL = string.Format("insert into jieguo(id,teaName,dept) Values({0},{1},{2})", id,teaName, dept);
                        //Execute(ResponseSQL);
                        Response.Write(" <script language=javascript>alert('成功！'); </script>");
                    }
                }
                else
                {
                    Response.Write(" <script language=javascript>alert('不是excel文件！'); </script>");
                    return;
                }
            }
        }