c#以带tab的txt文件做数据源的问题

Question

  OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.InitialDirectory = "c:";//注意这里写路径时要用c:而不是c:　
            openFileDialog.Filter = "文本文件|*.*|C#文件|*.cs|所有文件|*.*";
            openFileDialog.RestoreDirectory = true;
            openFileDialog.FilterIndex = 1;
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {                string str = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=";
                str += @openFileDialog.FileName.Substring(0, openFileDialog.FileName.LastIndexOf('\\') + 1) + ";Extended Properties=\"Text;HDR=Yes;FMT=Delimited\"";                dsuser = Conn.ReturnDataSet(str, CommandType.Text, "Select * From  " + openFileDialog.FileName.Substring(openFileDialog.FileName.LastIndexOf('\\') + 1, openFileDialog.FileName.Trim().Length - (openFileDialog.FileName.LastIndexOf('\\') + 1)), "data");                foreach (DataColumn dc in dsuser.Tables[0].Columns)
                {
                    MessageBox.Show(dc.ColumnName); 
                //文件格式如下,提示发现只有一列,名列为h_no_name_zino_qx_flag_ziwen_card_pwd,tab用下划线来了 
            }
                                           }　
        }
jh no name zino qx flag ziwen card pwd
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