Excel列数据使用asp使字母表值为空。网

上传时 Excel datatable 这些值正在变为空白。

string filename = Path.GetFileName(fluploadData.FileName);
        // FileUpload.SaveAs(Server.MapPath("~/") + filename);
        string filenamewithoutrext = string.Empty;
        FileExt = Path.GetExtension(fluploadData.FileName).ToLower();
        if (Path.GetExtension(fluploadData.FileName).ToLower() != ".xls" &&
            Path.GetExtension(fluploadData.FileName).ToLower() != ".xlsx"
        )
        {

            Response.Write("Only .xls,.xlsx are allowed.!");
            return;
        }

        filenamewithoutrext = Path.GetFileNameWithoutExtension(fluploadData.FileName).ToLower();

        string path = Server.MapPath("UploadData\\");
        string filename_ = filenamewithoutrext;

        //   DeleteDirectory(path);
        if (!Directory.Exists(path))   // CHECK IF THE FOLDER EXISTS. IF NOT, CREATE A NEW FOLDER.
        {
            Directory.CreateDirectory(path);
        }
        else
        {
            foreach (string file in Directory.GetFiles(path))
            {
                File.Delete(file);
            }
        }

        string fname;
        fname = path + filename_ + ".xls";

        fluploadData.SaveAs(fname);
        HttpContext.Current.Session["ExcelFilePath"] = fname;

        string conStr = "";
        System.Data.DataTable dtExcelRows = new System.Data.DataTable();

        switch (FileExt)
        {
            case ".xls": //Excel 97-03
                conStr = System.Configuration.ConfigurationManager.ConnectionStrings["Excel03ConString"].ConnectionString;
                break;
            case ".xlsx": //Excel 07
                conStr = System.Configuration.ConfigurationManager.ConnectionStrings["Excel07ConString"].ConnectionString;
                break;
        }

        conStr = String.Format(conStr, fname, "YES");

        System.Data.OleDb.OleDbConnection connExcel = new System.Data.OleDb.OleDbConnection(conStr);
        System.Data.OleDb.OleDbCommand cmdExcel = new System.Data.OleDb.OleDbCommand();
        System.Data.OleDb.OleDbDataAdapter oda = new System.Data.OleDb.OleDbDataAdapter();
        cmdExcel.Connection = connExcel;
        connExcel.Open();
        System.Data.DataTable dtExcelSchema = connExcel.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
        System.Data.DataTable dtExcelColumnsTable = connExcel.GetSchema("Columns");
        //string SheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString().Replace('\'', ' ').Trim();
        string SheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString().Trim();  
        cmdExcel.CommandText = "SELECT * From [" + SheetName + "]";
        oda.SelectCommand = cmdExcel;
        oda.Fill(dtExcelRows);
        connExcel.Close();