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1、附录1BeginningASP.NET2.0inC#ASP(ActiveServerPages)isarelativelynewtechnologythat’salreadyleaptthroughseveralstagesofevolution.Itwasintroducedaboutsevenyearsagoasaneasywaytoadddynamiccontenttoordinarywebpages.Sincethen,it’sgrownintosomethingmuchmoreambitious:aplatformforcreatingadvancedwebapp
2、lications,includinge-commerceshops,data-drivenportalsites,andjustaboutanythingelseyoucanfindontheInternet.ASP.NET2.0isthelatestversionofASP,anditrepresentsthemostdramaticchangeyet.WithASP.NET,developersnolongerneedtopastetogetherajumbleofHTMLandscriptcodeinordertoprogramtheWeb.Instead,youc
3、ancreatefull-scalewebapplicationsusingnothingbutcodeandadesigntoolsuchasVisualStudio2005.Thecostofallthisinnovationisthelearningcurve.Notonlydoyouneedtolearnhowtouseanadvanceddesigntool(VisualStudio)andatoolkitofobjects(the.NETFramework),youalsoneedtomasteraprogramminglanguagesuchasC#.TheI
4、nternetbeganinthelate1960sasanexperiment.Itsgoalwastocreateatrulyresilientinformationnetwork—onethatcouldwithstandthelossofseveralcomputerswithoutpreventingtheothersfromcommunicating.Drivenbypotentialdisasterscenarios(suchasnuclearattack),theU.S.DepartmentofDefenseprovidedtheinitialfunding
5、.TheearlyInternetwasmostlylimitedtoeducationalinstitutionsanddefensecontractors.Itflourishedasatoolforacademiccollaboration,allowingresearchersacrosstheglobetoshareinformation.Intheearly1990s,modemswerecreatedthatcouldworkoverexistingphonelines,andtheInternetbegantoopenuptocommercialusers.
6、In1993,thefirstHTMLbrowserwascreated,andtheInternetrevolutionbegan.Itwouldbedifficulttodescribeearlywebsitesaswebapplications.Instead,thefirstgenerationofwebsitesoftenlookedmorelikebrochures,consistingmostlyoffixedHTMLpagesthatneededtobeupdatedbyhand.BasicHTMLpageisalittlelikeaword-process
7、ingdocument—itcontainsformattedcontentthatcanbedisplayedonyourcomputer,butitdoesn’tactuallydoanything.ThefollowingexampleshowsHTMLatitssimplest,withadocumentthatcontainsaheadingandsinglelineoftext:AnHTMLdocumenthastwotypesofcontent:thetextandthetagsthattellthe
