如何使用C#中的oledb仅上传Excel电子表格的非空行？

我正在使用oledb连接将excel表导入DataTable,如下所示.

private static DataTable UploadExcelSheet(string fileName)
    {
        DataTable uploadDataTable;
        using (OleDbConnection objXConn = new OleDbConnection())
        {
            objXConn.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName +
                                            ";Extended Properties=\"Excel 12.0;IMEX=1\"";

            objXConn.open();

            OleDbCommand objCommand =
                new OleDbCommand("SELECT * FROM Template$",objXConn);
            OleDbDataAdapter objDataAdapter = new OleDbDataAdapter();

            // retrieve the Select command for the Spreadsheet
            objDataAdapter.SelectCommand = objCommand;

            // Create a DataSet
            DataSet objDataSet = new DataSet();

            // Populate the DataSet with the spreadsheet worksheet data
            objDataAdapter.Fill(objDataSet);
            uploadDataTable = objDataSet.Tables[0];
        }

        return uploadDataTable;
    }

一切都正常,但用户在上传excel之前删除几行的内容时会出现问题.它读取这些空行以及非空行,并且由于违反业务规则(缺少必填字段),数据库中的保存数据将失败.
我试过的是把条件放在查询中：

"SELECT * FROM  WHERE  not [CandidateId*] = 0 or not [Firstname*] = '' or not [Lastname] = '' or not [type*] = '' or not [dob*] =" + dbnull.Value

所以它只会选择那些有数据的行.
但是我无法比较非字符串字段,即Date,Integer等.当空的时候,它们作为dbnull进行比较.
可以任何一个建议的方式来做,我不想使用DataReader.

解决方法

使用

“.. WHERE NOT([Lastname] =”OR [dob *] IS NULL OR …)