单项选择题
You are creating a Windows Forms application by using the .NET Framework 3.5 The application is used by a financial service provider.You discover that the service provider transfers large amounts of data by using XML.You need to read and validate the XMLdocuments in the most time efficient manner.Which technology should you use？（）
A.The XmlReader class
B.The XmlDocument class
C.The XmlResolver class
D.The LINQ to XML method
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YouarecreatingaWindowsFormsapplicationbyusingthe.NETFramework3.5.Theapplicationstoresalistofpartnumbersinanintegerbasedarrayasshowninthefollowingcodesegment（Linenumbersareincludedforreferenceonly） YouneedtouseaLINQtoObjectsquerytoperformthefollowingtasks：-Obtainalistofduplicatepartnumbers： （1）Orderthelistbypartnumbers （2）Providethepartnumbersandthetotalcountofpartnumbersintheresults Whichcodesegmentshouldyouinsert？（）
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