交换数据学习一：将xml文本读取到DataSet并显示

//xml文档内容
<?xml version = "1.0" encoding="gb2312" standalone="yes"?>
<VFPData>
 <company>
  <companyno>100</companyno>
  <companyname>上海</companyname>
  <ceoname>陈四</ceoname>
  <ceomail>lsdd@126.com</ceomail>
  <ceotel>021-62225813</ceotel>
  <ywtel>021-62932763、62984475</ywtel>
  <kftel>021-629443215、63274478</kftel>
  <gscz>021-62238736</gscz>
  <gsaddress>上海浦东</gsaddress>
  <postcode>32232</postcode>
  <memo>这里是备注的内容。 这里是备注的内容。
</memo>
 </company>
 <company>
  <companyno>200</companyno>
  <companyname>南京</companyname>
  <ceoname>李国华</ceoname>
  <ceomail>lgh_m@126.com</ceomail>
  <ceotel>025-86683455</ceotel>
  <ywtel>025-86683455</ywtel>
  <kftel>025-86683455、88883122</kftel>
  <gscz>025-87663455</gscz>
  <gsaddress>南京市建邺区</gsaddress>
  <postcode>34000</postcode>
  <memo/>
 </company>
 <company>
  <companyno>300</companyno>
  <companyname>成都</companyname>
  <ceoname>小明</ceoname>
  <ceomail>xiaoming@126.com</ceomail>
  <ceotel>028-89014668</ceotel>
  <ywtel>028-86884668、86713998</ywtel>
  <kftel>028-86722218、86995538</kftel>
  <gscz>028-86717738</gscz>
  <gsaddress>成都市人民南路</gsaddress>
  <postcode>24000</postcode>
&nbs