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The.NetframeworkisasoftwaredevelopmentplatformdevelopedbyMicrosoft.Theframeworkwasmeanttocreateapplications,whichwouldrunontheWindowsPlatform.Thefirstversionofthe.Netframeworkwasreleasedintheyear2000.
Theversionwascalled.Netframework1.0.The.Netframeworkhascomealongwaysincethen,andthecurrentversionis4.6.1.The.Netframeworkcanbeusedtocreateboth-FormbasedandWebbasedapplications.Webservicescanalsobedevelopedusingthe.Netframework.
TheframeworkalsosupportsvariousprogramminglanguagessuchasVisualBasicandC#.Sodeveloperscanchooseandselectthelanguagetodeveloptherequiredapplication.Inthischapter,youwilllearnsomebasicsofthe.Netframework.
Thearchitectureofthe.Netframeworkisbasedonthefollowingkeycomponents;1. CommonLanguageRuntime-TheCommonLanguageInfrastructureorCLIisaplatformonwhichthe.Netprogramsareexecuted.TheCLIhasthefollowingkeyfeatures:
ExceptionHandling-Exceptionsareerrorswhichoccurwhentheapplicationisexecuted.
Examplesofexceptionsare:
Ifanapplicationtriestoopenafileonthelocalmachine,butthefileisnotpresent.
Iftheapplicationtriestofetchsomerecordsfromadatabase,buttheconnectiontothedatabaseisnotvalid.
GarbageCollection-Garbagecollectionistheprocessofremovingunwantedresourceswhentheyarenolongerrequired.
Examplesofgarbagecollectionare
AFilehandlewhichisnolongerrequired.Iftheapplicationhasfinishedalloperationsonafile,thenthefilehandlemaynolongerberequired.Thedatabaseconnectionisnolongerrequired.Iftheapplicationhasfinishedalloperationsonadatabase,thenthedatabaseconnectionmaynolongerberequired.
WorkingwithVariousprogramminglanguagesAsnotedinanearliersection,adevelopercandevelopanapplicationinavarietyof.Netprogramminglanguages.
1. Language-Thefirstlevelistheprogramminglanguageitself,themostcommononesareVB.NetandC#.
2. CompilerThereisacompilerwhichwillbeseparateforeachprogramminglanguage.SounderlyingtheVB.Netlanguage,therewillbeaseparateVB.Netcompiler.SimilarlyforC#,youwillhaveanothercompiler.
3. CommonLanguageInterpreterThisisthefinallayerin.Netwhichwouldbeusedtoruna.netprogramdevelopedinanyprogramminglanguage.SothesubsequentcompilerwillsendtheprogramtotheCLIlayertorunthe.Netapplication.
2. ClassLibrary-The.NETFrameworkincludesasetofstandardclasslibraries.Aclasslibraryisacollectionofmethodsandfunctionsthatcanbeusedforthecorepurpose.
Forexample,thereisaclasslibrarywithmethodstohandleallfileleveloperations.Sothereisamethodwhichcanbeusedtoreadthetextfromafile.Similarly,thereisamethodtowritetexttoafile.
MostofthemethodsaresplitintoeithertheSystem.*orMicrosoft.*namespaces.(Theasterisk*justmeansareferencetoallofthemethodsthatfallundertheSystemorMicrosoftnamespace)
Anamespaceisalogicalseparationofmethods.Wewilllearnthesenamespacesmoreindetailinthesubsequentchapters.
WinFormsThisisusedfordevelopingForms-basedapplications,whichwouldrunonanendusermachine.Notepadisanexampleofaclient-basedapplication.
ASP.NetThisisusedfordevelopingwebbasedapplications,whicharemadetorunonanybrowsersuchasInternetExplorer,ChromeorFirefox.
TheWebapplicationwouldbeprocessedonaserver,whichwouldhaveInternetInformationServicesInstalled.
InternetInformationServicesorIISisaMicrosoftcomponentwhichisusedtoexecuteanASP.netapplication.
Theresultoftheexecutionisthensenttotheclientmachines,andtheoutputisshowninthebrowser.
Forexample,inframework3.5andonwardsakeyframeworkcalledtheEntityframeworkwasreleased.Thisframeworkisusedtochangetheapproachinwhichtheapplicationsaredevelopedwhileworkingwithdatabases.
VersionnumberCLRversionReleasedate
1.01.02002-02-13
1.11.12003-04-24
2.02.02005-11-07
3.02.02006-11-06
3.52.02007-11-19
4.042010-04-12
4.542012-08-15
4.5.142013-10-17
4.5.242014-05-05
4.642015-07-20
4.6.142015-11-17
Microsoftalwaysensuresthat.NetframeworksareincompliancewithallthesupportedWindowsoperatingsystems.
Thefollowingdesignprinciplesofthe.Netframeworkiswhatmakesitveryrelevanttocreate.Netbasedapplications.
1. Interoperability-The.Netframeworkprovidesalotofbackwardsupport.Supposeifyouhadanapplicationbuiltonanolderversionofthe.Netframework,say2.0.Andifyoutriedtorunthesameapplicationonamachinewhichhadthehigherversionofthe.Netframework,say3.5.Theapplicationwouldstillwork.Thisisbecausewitheveryrelease,Microsoftensuresthatolderframeworkversionsgelwellwiththelatestversion.
2. Portability-Applicationsbuiltonthe.NetframeworkcanbemadetoworkonanyWindowsplatform.Andnowinrecenttimes,MicrosoftisalsoenvisioningtomakeMicrosoftproductsworkonotherplatforms,suchasiOSandLinux.
3. Security-The.NETFrameworkhasagoodsecuritymechanism.Theinbuiltsecuritymechanismhelpsinbothvalidationandverificationofapplications.Everyapplicationcanexplicitlydefinetheirsecuritymechanism.Eachsecuritymechanismisusedtogranttheuseraccesstothecodeortotherunningprogram.
4. Memorymanagement-TheCommonLanguageruntimedoesalltheworkormemorymanagement.The.Netframeworkhasallthecapabilitytoseethoseresources,whicharenotusedbyarunningprogram.Itwouldthenreleasethoseresourcesaccordingly.ThisisdoneviaaprogramcalledtheGarbageCollectorwhichrunsaspartofthe.Netframework.Thegarbagecollectorrunsatregularintervalsandkeepsoncheckingwhichsystemresourcesarenotutilized,andfreesthemaccordingly.
5. Simplifieddeployment-The.Netframeworkalsohavetools,whichcanbeusedtopackageapplicationsbuiltonthe.Netframework.Thesepackagescanthenbedistributedtoclientmachines.Thepackageswouldthenautomaticallyinstalltheapplication.
Summary.NetisaprogramminglanguagedevelopedbyMicrosoft.ItwasdesignedtobuildapplicationswhichcouldrunontheWindowsplatform.The.NetprogramminglanguagecanbeusedtodevelopFormsbasedapplications,WebbasedapplicationsandWebservices.
Developerscanchoosefromavarietyofprogramminglanguagesavailableonthe.Netplatform.ThemostcommononesareVB.NetandC#.
MicrosoftVisualStudioisanintegrateddevelopmentenvironment(IDE)fromMicrosoft.ItisusedtodevelopcomputerprogramsforMicrosoftWindows.VisualStudioisonestopshopforallapplicationsbuiltonthe.Netplatform.Onecandevelop,debugandrunapplicationsusingVisualStudio.
BothFormsbasedandwebbasedapplicationscanbedesignedanddevelopedusingthisIDE.TheVisualStudiohasthebelow-mentionedfeatures1. Creationofanapplicationinany.NetlanguageTheVisualStudioIDEcanbeusedtocreateanapplicationinany.Netlanguage.Hence,adevelopercanuseC#,VB.NetorevenF#todevelopanapplication.
2. CreationofanyapplicationtypeTheVisualStudioIDEcanbeusedtocreateanapplicationofanytype.(Web-basedapplicationorWindowsFormsbasedapplication).
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