ASP.NETtechnologyandVBlanguageASP.NETisaunifiedWebdevelopmentmodelthatincludestheservicesnecessaryforyoutobuildenterprise-classWebapplicationswithaminimumofcoding.ASP.NETispartofthe.NETFramework,andwhencodingASP.NETapplicationsyouhaveaccesstoclassesinthe.NETFramework.Youcancodeyourapplicationsinanylanguagecompatiblewiththecommonlanguageruntime(CLR),includingMicrosoftVisualBasic,C#,JScript.NET,andJ#.TheselanguagesenableyoutodevelopASP.NETapplicationsthatbenefitfromthecommonlanguageruntime,typesafety,inheritance,andsoon.ASP.NETincludes:ApageandcontrolsframeworkTheASP.NETcompilerSecurityinfrastructureState-managementfacilitiesApplicationconfigurationHealthmonitoringandperformancefeaturesDebuggingsupportAnXMLWebservicesframeworkExtensiblehostingenvironmentandapplicationlifecyclemanagementAnextensibledesignerenvironment.TheASP.NETpageandcontrolsframeworkisaprogrammingframeworkthatrunsonaWebservertodynamicallyproduceandrenderASP.NETWebpages.ASP.NETWebpagescanberequestedfromanybrowserorclientdevice,andASP.NETrendersmarkup(suchasHTML)totherequestingbrowser.Asarule,youcanusethesamepageformultiplebrowsers,becauseASP.NETrenderstheappropriatemarkupforthebrowsermakingtherequest.However,youcandesignyourASP.NETWebpagetotargetaspecificbrowser,suchasMicrosoftInternetExplorer6,andtakeadvantageofthefeaturesofthatbrowser.ASP.NETsupportsmobilecontrolsforWeb-enableddevicessuchascellularphones,handheldcomputers,andpersonaldigitalassistants(PDAs).ASP.NETWebpagesarecompletelyobject-oriented.WithinASP.NETWebpagesyoucanworkwithHTMLelementsusingproperties,methods,andevents.TheASP.NETpageframeworkremovestheimplementationdetailsoftheseparationofclientandserverinherentinWeb-basedapplicationsbypresentingaunifiedmodelforrespondingtoclienteventsincodethatrunsattheserver.Theframeworkalsoautomaticallymaintainsthestateofapageandthecontrolsonthatpageduringthepageprocessinglifecycle.TheASP.NETpageandcontrolsframeworkalsoenablesyoutoencapsulatecommonUIfunctionalityineasy-to-use,reusablecontrols.Controlsarewrittenonce,canbeusedinmanypages,andareintegratedintotheASP.NETWebpagethattheyareplacedinduringrendering.TheASP.NETpageandcontrolsframeworkalsoprovidesfeaturestocontroltheoveralllookandfeelofyourWebsiteviathemesandskins.Youcandefinethemesandskinsandthenapplythematapageleveloratacontrollevel.AllASP.NETcodeiscompiled,whichenablesstrongtyping,performanceoptimizations,andearlybinding,amongotherbenefits.Oncethecodehasbeencompiled,thecommonlanguageruntimefurthercompilesASP.NETcodetonativecode,providingimprovedperformance.ASP.NETincludesacompilerthatwillcompileallyourapplicationcomponentsincludingpagesandcontrolsintoanassemblythattheASP.NEThostingenvironmentcanthenusetoserviceuserrequests.Inadditiontothesecurityfeaturesof.NET,ASP.NETprovidesanadvancedsecurityinfrastructureforauthenticatingandauthorizinguseraccessaswellasperformingothersecurity-relatedtasks.YoucanauthenticateusersusingWindowsauthenticationsuppliedbyIIS,oryoucanmanageauthenticationusingyourownuserdatabaseusingASP.NETformsauthenticationandASP.NETmembership.Additionally,youcanmanagetheauthorizationtothecapabilitiesandinformationofyourWebapplicationusingWindowsgroupsoryourowncustomroledatabaseusingASP.NETroles.Youcaneasilyremove,addto,orreplacetheseschemesdependingupontheneedsofyourapplication.ASP.NETalwaysrunswithaparticularWindowsidentitysoyoucansecureyourapplicationusingWindowscapabilitiessuchasNTFSAccessControlLists(ACLs),databasepermissions,andsoon.FormoreinformationontheidentityofASP.NET,ASP.NETprovidesintrinsicstatemanagementfunctionalitythatenablesyoutostoreinformationbetweenpagerequests,suchascustomerinformationorthecontentsofashoppingcart.Youcansaveandmanageapplication-specific,session-specific,page-specific,user-specific,anddeveloper-definedinformation.Thisinformationcanbeindependentofanycontrolsonthepage.ASP.NEToffersdistributedstatefacilities,whichenableyoutomanagestateinformationacrossmultipleinstancesofthesameapplicationononecomputeroronseveralcomputers.ASP.NETapplicationsuseaconfigurationsystemthatenablesyoutodefineconfigurationsettingsforyourWebserver,foraWebsite,orforindividualapplications.YoucanmakeconfigurationsettingsatthetimeyourASP.NETapplicationsaredeployedandcanaddorreviseconfigurationsettingsatanytimewithminimalimpactonoperationalWebapplicationsandservers.ASP.NETconfigurationsettingsarestoredinXML-basedfiles.BecausetheseXMLfilesareASCIItextfiles,itissimpletomakeconfigurationchangestoyourWebapplications.Youcanextendtheconfigurationschemetosuityourrequirements.ASP.NETincludesfeaturesthatenableyoutomonitorhealthandperformanceofyourASP.NETapplication.ASP.NEThealthmonitoringenablesreportingofkeyeventsthatprovideinformationaboutthehealthofanapplicationandabouterrorconditions.Theseeventsshowacombinationofdiagnosticsandmonitoringcharacteristicsandofferahighdegreeofflexibilityintermsofwhatisloggedandhowitislogged.ASP.NETsupportstwogroupsofperformancecountersaccessibletoyourapplications:countergroupASP.NETtakesadvantageoftherun-timedebugginginfrastructuretoprovidecross-languageandcross-computerdebuggingsupport.Youcandebugbothmanagedandunmanagedobjects,aswellasalllanguagessupportedbythecommonlanguageruntimeandscriptlanguages.Inaddition,theASP.NETpageframeworkprovidesatracemodethatenablesyoutoinsertinstrumentationmessagesintoyourASP.NETWebpages.ASP.NETsupportsXMLWebservices.AnXMLWebserviceisacomponentcontainingbusinessfunctionalitythatenablesapplicationstoexchangeinformationacrossfirewallsusingstandardslikeHTTPandXMLmessaging.XMLWebservicesarenottiedtoaparticularcomponenttechnologyorobject-callingconvention.Asaresult,programswritteninanylanguage,usinganycomponentmodel,andrunningonanyoperatingsystemcanaccessXMLWebservices.ASP.NETincludesanextensiblehostingenvironmentthatcontrolsthelifecycleofanapplicationfromwhenauserfirstaccessesaresource(suchasapage)intheapplicationtothepointatwhichtheapplicationisshutdown.WhileASP.NETreliesonaWebserver(IIS)asanapplicationhost,ASP.NETprovidesmuchofthehostingfunctionalityitself.ThearchitectureofASP.NETenablesyoutorespondtoapplicationeventsandcreatecustomHTTPhandlersandHTTPmodules.ASP.NETincludesenhancedsupportforcreatingdesignersforWebservercontrolsforusewithavisualdesigntoolsuchasVisualStudio.Designersenableyoutobuildadesign-timeuserinterfaceforacontrol,sothatdeveloperscanconfigureyourcontrolspropertiesandcontentinthevisualdesigntool.MicrosoftVisualBasic,(abbreviateVB)astoolthemostofapplicationprogramoneofunderWindowsoperatingplatform.Nomatterbeginnerorprofessionaldeveloper,VBhasallofferedawholesetoftoolstothem,Developmentapplicationprogramthatitcanberelaxedandconvenient.SoVBasmostcomputerfirst-selectedtheABCofprogramminglanguageofbeginner.Visualmeanmethodtoadoptvisualuserofdevelopmentfigureinterface(GUI),needandwritealargenumberofcodegoanddescribeinterfaceappearanceandpositionofelementseldom,Towandshowcontrollingpartthatneedcorrespondingpositiontogetscreencanhelpfiguredesigninterface,useroffigure,；BasicmeansBASIClanguage,becauseVBisdevelopedonthebasisofalreadyexistingBAISClanguage.VBisakindofprogramminglanguageincommonuseofMicrosoft,It,includingVBAofthenumerousWindowsapplicationsoftwareuseVBlanguageinMicrosoftExcel,MicrosoftAccessed.,Foruserstocarryonthesecondarydevelopment；MakewebpageusemoreVBScriptscriptlanguagesubcollectionofVBtooatpresent.UtilizedataofVBvisitcharacteristicusercanestablishthedatabasetomostdatabaseformsincludingMicrosoftSQLServerandotherenterprisesdatabaseWiththeapplicationprogramoffront,andadjustableserviceendpart.UtilizeActiveX(TM)technology,VBcanusewordprocessor,electronicdatalistheWindowsfunctionthatapplicationprogramoffersextremely,ExcelofMicrosoft,WordofMicrosoft,EvencanusebyVBspecialtyeditionorenterpriseapplicationprogramandtargetthateditionestablishdirectly.Theprocedurethatusersestablishedfinallyisareal.EXEfile,canissuefreely.VBofferstudyedition,thespecialtyeditionandenterpriseedition,usetosatisfiedwithdifferentdevelopmentdemands.StudyeditionmakeprogrammingpersonneldevelopWindowsandWindowsapplicationprogramofNTveryeasily.Thespecialtyeditionhasofferedthedevelopinginstrumentwithcompletefunctiontoprogrammingpersonnelofthespecialty,Includestudyingallfunctionsofeditioninthespecialtyedition.Enterpriseeditionallowtheprofessionalpersonneltoestablishstrongdistributedapplicationprogramintheformofgroup.Itincludesallcharacteristicsofthespecialtyedition.Socanchoosedifferenteditionsaccordingtodifferentneeds.Section1integrateddevelopmentenvironmentsIntegratedenvironmentofVBcallIDE,madeupofalotofparts,includetitleboard,menufence,toolfence,controllingpartcase,Andwindowbodywindow,engineeringmanagementdevicewindow,attributewindow,codewindowandwindowbodyoverallarrangementwindowbodyoverallarrangement,etc.ofdesigningetc.Havecoveredallfunctions,suchasdesignwhichdevelopstheapplicationprogram,editting,compilinganddebugging,etc.InVB,theapplicationprogramcallstheprojecttoo.WhenstartVBandopenanewprojectforthefirsttime,canseeandpursueintegrateddevelopmentenvironmentinterfacethatshow.VBcomeandorganizedevelopmentofapplicationprogramthroughproject,useprojectcomeandmanageandformfilesofapplicationprogram.Oneprojectusestheenvironmenttomakeupb