C#实现提高xml读写速度的方法

dim domxmldocument as system.xml.xmldocument 
  dim tmppath as string = apptempfilepath 
  dim xmlfile as string = tmppath + "＼testxml.xml" 
'窗体加载事件 
  private sub testxml_load(byval sender as system.object, byval e as system.eventargs) handles mybase.load 
  '读xml过程测试通过 
  dim domxmldocument as system.xml.xmldocument 
  dim tmppath as string = apptempfilepath 
  dim xmlfile as string = tmppath + "＼testxml.xml" 
  dim reader as system.xml.xmlreader = nothing 
  try 
  reader = new xml.xmltextreader(xmlfile) 
  'reader. 
  while reader.read 
  me.lboxxml.items.add(reader.name + reader.value) 
  end while 
  catch ex as exception 
  msgbox(ex.message) 
  finally 
  if not (reader is nothing) then 
  reader.close() 
  end if 
  end try 
  end sub 
  '载入xml事件 
  private sub btnxmlload_click(byval sender as system.object, byval e as system.eventargs) handles btnxmlload.click 
  'me.lboxxml.items.clear() 
  ''读xml过程测试通过 
  'dim reader as system.xml.xmlreader = nothing 
  'try 
  ' reader = new xml.xmltextreader(xmlfile) 
  ' while reader.read 
  ' me.lboxxml.items.add(reader.name + ":" + reader.value) 
  ' end while 
  'catch ex as exception 
  ' msgbox(ex.message) 
  'finally 
  ' if not (reader is nothing) then 
  ' reader.close() 
  ' end if 
  'end try 
  dim ds as new dataset 
  try 
  '如果直接使用ds做datasource则不会展开datagrid，用dv则能直接显示正确。 
  ds.readxml(xmlfile) 
  dim tb as datatable 
  dim dv as dataview 
  tb = ds.tables(0) 
  dv = new dataview(tb) 
  datagrid1.datasource = dv 
  'datagrid1.datamember = "testxmlmember" 
  'datagrid1.datamember = "employeefname" 
  'dim dxd as new xmldatadocument 
  catch ex as exception 
  msgbox(ex.message.tostring) 
  end try 
  end sub 
  '保存新建xml内容事件 
  private sub btnsavenew_click(byval sender as system.object, byval e as system.eventargs) handles btnsavenew.click 
  dim mytw as new xmltextwriter(tmppath + "＼testxmlwrite.xml", nothing) 
  mytw.writestartdocument() 
  mytw.formatting = formatting.indented 
  mytw.writestartelement("team") 
  mytw.writestartelement("player") 
  mytw.writeattributestring("name", "george zip") 
  mytw.writeattributestring("position", "qb") 
  mytw.writeelementstring("nickname", "zippy") 
  mytw.writeelementstring("jerseynumber", xmlconvert.tostring(7)) 
  mytw.writeendelement() 
  mytw.writeendelement() 
  mytw.writeenddocument() 
  mytw.close() 
  end sub