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1、附录1BeginningASP.NET2.0inC#ASP(ActiveServerPages)isarelativelynewtechnologythat’salreadyleaptthroughseveralstagesofevolution.Itwasintroducedaboutsevenyearsagoasaneasywaytoadddynamiccontenttoordinarywebpages.Sincethen,it’sgrownintosomethingmuchmoreambitious:aplatformfor
2、creatingadvancedwebapplications,includinge-commerceshops,data-drivenportalsites,andjustaboutanythingelseyoucanfindontheInternet.ASP.NET2.0isthelatestversionofASP,anditrepresentsthemostdramaticchangeyet.WithASP.NET,developersnolongerneedtopastetogetherajumbleofHTMLands
3、criptcodeinordertoprogramtheWeb.Instead,youcancreatefull-scalewebapplicationsusingnothingbutcodeandadesigntoolsuchasVisualStudio2005.Thecostofallthisinnovationisthelearningcurve.Notonlydoyouneedtolearnhowtouseanadvanceddesigntool(VisualStudio)andatoolkitofobjects(the.
4、NETFramework),youalsoneedtomasteraprogramminglanguagesuchasC#.TheInternetbeganinthelate1960sasanexperiment.Itsgoalwastocreateatrulyresilientinformationnetwork—onethatcouldwithstandthelossofseveralcomputerswithoutpreventingtheothersfromcommunicating.Drivenbypotentialdi
5、sasterscenarios(suchasnuclearattack),theU.S.DepartmentofDefenseprovidedtheinitialfunding.TheearlyInternetwasmostlylimitedtoeducationalinstitutionsanddefensecontractors.Itflourishedasatoolforacademiccollaboration,allowingresearchersacrosstheglobetoshareinformation.Inth
6、eearly1990s,modemswerecreatedthatcouldworkoverexistingphonelines,andtheInternetbegantoopenuptocommercialusers.In1993,thefirstHTMLbrowserwascreated,andtheInternetrevolutionbegan.Itwouldbedifficulttodescribeearlywebsitesaswebapplications.Instead,thefirstgenerationofwebs
7、itesoftenlookedmorelikebrochures,consistingmostlyoffixedHTMLpagesthatneededtobeupdatedbyhand.BasicHTMLpageisalittlelikeaword-processingdocument—itcontainsformattedcontentthatcanbedisplayedonyourcomputer,butitdoesn’tactuallydoanything.ThefollowingexampleshowsHTMLatitss
8、implest,withadocumentthatcontainsaheadingandsinglelineoftext:AnHTMLdocumenthastwotypesofcontent:thetextandthetagsthattellthe
