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1、BeginningASP.NET2.0inC#ASP(ActiveServerPages)isarelativelynewtechnologythat’salreadyleaptthroughseveralstagesofevolution.Itwasintroducedaboutsevenyearsagoasaneasywaytoadddynamiccontenttoordinarywebpages.Sincethen,it’sgrownintosomethingmuchmoreambitious:aplatformforcreatingadvancedwebapplications
2、,includinge-commerceshops,data-drivenportalsites,andjustaboutanythingelseyoucanfindontheInternet.ASP.NET2.0isthelatestversionofASP,anditrepresentsthemostdramaticchangeyet.WithASP.NET,developersnolongerneedtopastetogetherajumbleofHTMLandscriptcodeinordertoprogramtheWeb.Instead,youcancreatefull-sc
3、alewebapplicationsusingnothingbutcodeandadesigntoolsuchasVisualStudio2005.Thecostofallthisinnovationisthelearningcurve.Notonlydoyouneedtolearnhowtouseanadvanceddesigntool(VisualStudio)andatoolkitofobjects(the.NETFramework),youalsoneedtomasteraprogramminglanguagesuchasC#.TheInternetbeganinthelate
4、1960sasanexperiment.Itsgoalwastocreateatrulyresilientinformationnetwork—onethatcouldwithstandthelossofseveralcomputerswithoutpreventingtheothersfromcommunicating.Drivenbypotentialdisasterscenarios(suchasnuclearattack),theU.S.DepartmentofDefenseprovidedtheinitialfunding.TheearlyInternetwasmostlyl
5、imitedtoeducationalinstitutionsanddefensecontractors.Itflourishedasatoolforacademiccollaboration,allowingresearchersacrosstheglobetoshareinformation.Intheearly1990s,modemswerecreatedthatcouldworkoverexistingphonelines,andtheInternetbegantoopenuptocommercialusers.In1993,thefirstHTMLbrowserwascrea
6、ted,andtheInternetrevolutionbegan.Itwouldbedifficulttodescribeearlywebsitesaswebapplications.Instead,thefirstgenerationofwebsitesoftenlookedmorelikebrochures,consistingmostlyoffixedHTMLpagesthatneededtobeupdatedbyhand.BasicHTMLpageisalittlelikeaword-processingdocument—itcontainsformattedcontentt
7、hatcanbedisplayedonyourcomputer,butitdoesn’tactuallydoanything.ThefollowingexampleshowsHTMLatitssimplest,withadocumentthatcontainsaheadingandsinglelineof1414text:AnHTMLdocumenthastwotypesofcontent:thetextandthetagsthattellth
