C# Interview Questions.docx

C# Interview Questions.docx

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C#InterviewQuestions

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C#InterviewQuestions

Basequestions.

1.ExplainthedifferencesbetweenServer-sideandClient-sidecode?

ANS:

Serversidecodewillexecuteatserverendallthebusinesslogicwillexecuteatserverendwhereasclientsidecodewillexecuteatclientsideatbrowserend.

2.Whattypeofcode（serverorclient）isfoundinaCode-Behindclass?

ANS:

Serverside.

3.Shouldvalidation（didtheuserenterarealdate）occurserver-sideorclient-side?

Why?

ANS:

clientside.thereisnoneedtogotovalidateuserinput.Ifitrelatestodatabasevalidationweneedtovalidateatserverside.

4.Whatdoesthe"EnableViewState"propertydo?

WhywouldIwantitonoroff?

ANS:

ITkeepsthedataofthecontrolduringpostbacks.

ifweturnoffthevaluesshouldnotpopulateduringserverroundtrip.

5.WhatisthedifferencebetweenServer.TransferandResponse.Redirect?

WhywouldIchooseoneovertheother?

ANS:

Server.Trnasferwillpreventroundtrip.itwillredirectpageswhichorinthesamedirectory.NOwaytopassthequerystrings.Thruhttpcontextwecanabletogetthepreviouspagecontrolvalues.

Response.Redirect:

Thereisaroundtriptoprocesstherequest.Wecanredirecttoanypageexternal/internalotherthanaspx.Wecanpassthequerystringthruwhichwecanmanagesessions.

6.Canyougiveanexampleofwhenitwouldbeappropriatetouseawebserviceasopposedtoanon-serviced.NETcomponent

ANS:

WebservicesarebestsuiteforHetrogeniousenvironment.

RemotingisbestsuiteforHomogeniousenvironment.ThesystemsthatunderCLR.

7.Let'ssayIhaveanexistingapplicationwrittenusingVisualStudio6（VB6,InterDev6）andthisapplicationutilizesWindows2000COM+transactionservices.Howwouldyouapproachmigratingthisapplicationto.NET

WeneedtohaveWrappertocommunicateCOMcomponentsin.net.andvisversa

CCW:

ComCallablewrapper.

RCW:

RUNtimecallablewrapper.

8.CanyouexplainthedifferencebetweenanADO.NETDatasetandanADORecordset?

\

ANS:

DIsconnectedarchitechure.Maintainacerelationschemas.MUtilpletablegrouping.

Connectedone.

9.CanyougiveanexampleofwhatmightbebestsuitedtoplaceintheApplication_StartandSession_Startsubroutines?

ANS:

APplication_startneedforglobalvariablewhichareavailableovertheapplication.

Sesssion_Start:

logindependent（userdependent）

10.IfI'mdevelopinganapplicationthatmustaccomodatemultiplesecuritylevelsthoughsecureloginandmyASP.NETwebappplicationisspannedacrossthreeweb-servers（usinground-robbinloadbalancing）whatwouldbethebestapproachtomaintainlogin-instatefortheusers?

ANS:

DatabaseSupport.

orThrustateservice.

11.WhatareASP.NETWebForms?

HowisthistechnologydifferentthanwhatisavailablethoughASP（1.0-3.0）?

ANS:

ASP.Interprepter..usethescriptengine.

ASP.NetCompiled.

12.HowdoesVB.NET/C#achievepolymorphism?

ANS:

Functionoverloading.

Operatoroverloading.

13.Canyouexplainwhatinheritanceisandanexampleofwhenyoumightuseit?

ANS:

Heredity.

Usetheexistingfunctionalityalongwithitsownproperities.

14.HowwouldyouimplementinheritanceusingVB.NET/C#?

ANS:

DerivedClass:

Basecalss

VB.NEt:

DerivedClassInheritsBaseclass

15.Whatsanassembly

ANS:

ABasicunitofexecutablecode>

Whichcontains:

Manifest-Metadata

versioning,Calture,IL,Reference

16.Describethedifferencebetweeninlineandcodebehind-whichisbestinalooselycoupledsolutionTightlycoupled-INLINE

ANS:

inlinefunctionbindatcompiletimecanwriteinaspxpagewithin<%%>.

17.Explainwhatadiffgramis,andagooduseforone

ANS:

isanxmlgrammer.Ittalksaboutstateofnodeinxmlfile.

18.WherewouldyouuseaniHTTPModule,andwhatarethelimitationsofanyapproachyoumighttakeinimplementingone

ANS:

PreprocessingbeforegoingtoIIS.

19.Whatarethedisadvantagesofviewstate/whatarethebenefits

ANS:

ITcanbehacked.pagesizeisheavy.

20.HowwouldyougetASP.NETrunninginApachewebservers-whywouldyouevendothis?

ANS:

----InstallMod_AspDotNet

AddattheendofC:

\ProgramFiles\ApacheGroup\Apache2\conf\httpd.confthefollowinglines

21.WhatsMSIL,andwhyshouldmydevelopersneedanappreciationofitifatall?

ANS:

MicrosoftIntermediatelanguage.whichistheoutputforallthe.netsupportedlanguagesaftercompilationwillproduce.

Appreciationforcrosslanguagesupport.

22.InwhatorderdotheeventsofanASPXpageexecute.Asadeveloperisitimportanttounderstandtheseevents?

ANS:

INIT,PageLoad,Prerender,UNload.

23.WhichmethoddoyouinvokeontheDataAdaptercontroltoloadyourgenerateddatasetwithdata?

Fill（）

24.CanyoueditdataintheRepeatercontrol?

NO

25.Whichtemplatemustyouprovide,inordertodisplaydatainaRepeatercontrol?

ITemtemplate

26.HowcanyouprovideanalternatingcolorschemeinaRepeatercontrol?

AlternateItemTemplate

27.Whatpropertymustyouset,andwhatmethodmustyoucallinyourcode,inordertobindthedatafromsomedatasourcetotheRepeatercontrol?

Datasource,

DataBind

28.WhatbaseclassdoallWebFormsinheritfrom?

System.Web.UI.Page

29.Whatmethoddoyouusetoexplicitlykillauserssession?

abondon（）

30.Howdoyouturnoffcookiesforonepageinyoursite?

disablecookies.

31.Whichtwopropertiesareoneveryvalidationcontrol?

controltovalidate,errormessage

32.Whattagsdoyouneedtoaddwithintheasp:

datagridtagstobindcolumnsmanually?

autogeneratedcolumnsissettofalse

33.Howdoyoucreateapermanentcookie?

Cooke=newcookie（）.

cooke.adddate.

34.WhattagdoyouusetoaddahyperlinkcolumntotheDataGrid?

hyperlinkcolumn

35.Whichmethoddoyouusetoredirecttheusertoanotherpagewithoutperformingaroundtriptotheclient?

Server.Transfer

36.WhatisthetransportprotocolyouusetocallaWebserviceSOAP

http

37.TrueorFalse:

AWebservicecanonlybewrittenin.NET

false

38.WhatdoesWSDLstandfor?

webservicediscriptionlanguage.itisusedtogenerateforproxy（serverobject）

39.WhatpropertydoyouhavetosettotellthegridwhichpagetogotowhenusingthePagerobject?

PageIndex.

40.WhereontheInternetwouldyoulookforWebservices?

UDDI

41.Whattagsdoyouneedtoaddwithintheasp:

datagridtagstobindcolumnsmanually.

Autogeneratecolumns

42.WhichpropertyonaComboBoxdoyousetwithacolumnname,priortosettingtheDataSource,todisplaydatainthecombobox?

datatext

datavalue

43.Howisapropertydesignatedasread-only?

get

44.Whichcontrolwouldyouuseifyouneededtomakesurethevaluesintwodifferentcontrolsmatched?

comparefiledvalidator

45.TrueorFalse:

TotestaWebserviceyoumustcreateawindowsapplicationorWebapplicationtoconsumethisservice?

no

46.Howmanyclassescanasingle.NETDLLcontain?

asmanyasuwant..

47.Whatisserialization,howitworksin.NET?

TheprimarypurposeofXMLserializationinthe.NETFrameworkistoenabletheconversionofXMLdocumentsandstreamstocommonlanguageruntimeobjectsandviceversa.SerializationofXMLtocommonlanguageruntimeobjectsenablesonetoconvertXMLdocumentsintoaformwheretheyareeasiertoprocessusingconventionalprogramminglanguages.Ontheotherhand,serializationofobjectstoXMLfacilitatespersistingortransportingthestateofsuchobjectsinanopen,standardscompliantandplatformagnosticmanner.

48.HowmanyarraytypesdoesC#provide?

Juggedarray,tablearray,…

GeneralQuestions

1.DoesC#supportmultiple-inheritance?

No. 

2.Whoisaprotectedclass-levelvariableavailableto?

Itisavailabletoanysub-class（aclassinheritingthisclass）.

3.Areprivateclass-levelvariablesinherited?

Yes,buttheyarenotaccessible. Althoughtheyarenotvisibleoraccessibleviatheclassinterface,theyareinherited.  

4.Describetheaccessibilitymodifier“protectedinternal”.

Itisavailabletoclassesthatarewithinthesameassemblyandderivedfromthespecified baseclass.  

5.What’sthetop.NETclassthateverythingisderivedfrom?

System.Object.  

6.Whatdoesthetermimmutablemean?

Thedatavaluemaynotbechanged. Note:

Thevariablevaluemaybechanged,buttheoriginalimmutabledatavaluewasdiscardedandanewdatavaluewascreatedinmemory.  

7.What’sthedifferencebetweenSystem.StringandSystem.Text.StringBuilderclasses?

System.Stringisimmutable. System.StringBuilderwasdesignedwiththepurposeofhavingamutablestringwhereavarietyofoperationscanbeperformed.  

8.What’stheadvantageofusingSystem.Text.StringBuilderoverSystem.String?

StringBuilderismoreefficientincaseswherethereisalargeamountofstringmanipulation. Stringsareimmutable,soeachtimeastringischanged, anewinstanceinmemoryiscreated. 

9.CanyoustoremultipledatatypesinSystem.Array?

No.  

10.What’sthedifferencebetweentheSystem.Array.CopyTo（）andSystem.Array.Clone（）?

TheClone（）methodreturnsanewarray（ashallowcopy）objectcontainingalltheelementsintheoriginalarray. TheCopyTo（）methodcopiestheelementsintoanotherexistingarray. Bothperformashallowcopy. Ashallowcopymeansthecontents（eacharrayeleme