Kill Your Tech Interview
Top 130 C# Interview Questions
Entry Junior Mid Senior Expert
Theoretical Questions
Q16iiP:
ubkWhat are ftlglwsfphtsaProperty Accessorssgvegubhqyfe?lkbi
Entry
Q2PnPL:
kqbpWhat is an onkObjectbqn?ixk
Objectbqn?ixk Entry
Q3oSt:
txeqxnWhat is the difference between gzashgcontinueacirmz and ivalqwbreaksqqwixj statements in C#?ckv
continueacirmz and ivalqwbreaksqqwixj statements in C#?ckv Entry
Q4bonh:
ucpwboWhat is C#?jqzmuxo
Entry
Q5lL1LN:
Related To: .NET Core
rommxWhat you understand by tcmdqsapwbValue typesztrwsiketjgf and swyryqloepvReference typesjndocbidzj in .NET? Provide some comparison.cga
Related To: .NET Core Junior
Q628uab:
txkWhat are sveknjugenericstctabgio in C#?fin
Junior
Q7e47oT:
ubxpgkHow is tffpfvybbdiException Handlingcnklpipbes implemented in C#?qirgec
Junior
Q8wH0IO:
fcnpucqWhy to use edhdfinallysvuvlp block in C#?ovwp
finallysvuvlp block in C#?ovwp Junior
Q9BPkk:
nqjfthWhat are partial classes?txrsj
Junior
Q1094QQ:
ufkhwrpCan mqgthiskxnyffg be used within a lcdaStaticgnr method?fwai
thiskxnyffg be used within a lcdaStaticgnr method?fwai Junior
Q11Kttk:
xxhwzzCan multiple catch blocks be executed?xuohu
Junior
Q12fox:
nnfWhat is xrwwhnjtveikSerializationccotigndu?ybek
Junior
Q13gzte0:
qqytigiWhat are the different types of classes in C#?pxerdh
Junior
Q14sAs:
togWhat is vkyoasefdkManagedkuyazwkedg or fkjuauzgmxpUnmanagedpqozqn Code?zjlp
Junior
Q15XcW:
greqWhat are jqawgbatdcnlReference Typesrswqobs in C#?loyshud
Junior
Junior
Q171dVP:
autWhat is the difference between zcxeistringuph and qojStringBuilderusogwvw in C#?ingo
stringuph and qojStringBuilderusogwvw in C#?ingo Junior
Q18Rchm:
Related To: .NET Core
uqjgWhat is zjdeasccuBoxingqgebsw and ymisclpsliUnboxingcwnmbkpygwh?kzzicof
Related To: .NET Core Junior
Q19W2G:
Related To: OOP
ixvtWhat is the difference between a fetzclassaog and a xyxnstructurepwq?ebf
Related To: OOPclassaog and a xyxnstructurepwq?ebf Junior
Q20tKb:
oeoWhat is the difference between a pvldfwStructuce and a kiopClasssim in C#?cpu
Structuce and a kiopClasssim in C#?cpu Junior
Q21OUBk:
wiyebjWhat is an nxydfgAbstract Classcwhxjajjl?lrowglu
Junior
Q226veRg:
mosfWhat is hzppqcjvpfjkginamespacehbfyhrgxtw in C#?sxb
Junior
Q23nP8b:
wsfWhat are iuuiyeftoyfyNullable typesbyqvmmulw in C#?erregfy
Junior
Q24hIF4:
fveyIn how many ways you can pass parameters to a method?dwe
Junior
Q25lws:
hkxqmeiWhat are dynamic type variables in C#?ysnn
Junior
Q26PTGK:
njhdoWhat is enum in C#?ufvnwkj
Junior
Q27ho1:
Related To: .NET Core
mkqeltIs there a way to catch efwyljqvrmultiplebezzwmmr exceptions at once and without code duplication?xfzhwwi
Related To: .NET CoreQ28jQ4:
agaExplain assignment vs shallow copy vs deep copy for a wlosepvxqRecordvglmfntvfcg in C# lubvlr
Q29hjLI:
iokaurrWhen to use uezwoeugRecordcmzwsnddf vs xkoyunskkxClassroxrdgj vs wwsryvcnyatasStructgkisekojkbfhl in C#?njyulhk
Q30a4iY:
sgkhmfhWhy can't you specify the accessibility modifier for methods inside the Interface?fpsebjd
Q31XYjDq:
atfepWhat is camkldilxgRecordpztiunondief in C#?zvsow
Q32L9swJ:
iothxWhat is an fxxqtsvwteoanonymous functionxqumvum in C#?yjzch
Q34guoe:
Related To: .NET Core
nxvzcExplain the difference between bnpxqyiTaskeelb and wgcsThreadgjw in .NETuqcapu
Related To: .NET CoreTaskeelb and wgcsThreadgjw in .NETuqcapuQ35G2I:
cqfzfdWhat is hypcsealedkzcl Class in C#?qjq
sealedkzcl Class in C#?qjqQ36tbj:
kitxfWhat is the difference between uylgyxsuuoverloadingbeqmmwhj and ahtzxztiwkaacoverridingpnwozdbnoxbaq?funz
Q37rT8Ek:
nimjWhat is xodzlwftxcuvqlambda expressionsimohzcdzetpb in C#?zlm
Q38BKz:
jdgvxyHow fusbhkngddencapsulationjbdaokuounz is implemented in C#?jflwe
Q39yKIKj:
qioWhat is insqvapglptvjReflectionbryjtuwore in C#.Net?lphoor
Q4096iQ:
Related To: OOP
sbyaauHow can you prevent a class from xwrjrbhoverridingqnzcqhygmjgy in C#?ehu
Related To: OOPQ41NuMG:
wicWhat is the use of Null Coalescing Operator (bjehd??wtx) in C#?rjie
??wtx) in C#?rjieQ42JsiQ:
fftlqzWhat is a losxruffacDestructorazledgpo in C# and when shall I create one?aqprjgt
Q43q2qlk:
Related To: OOP
dvakWhat is the difference between oowesoInterfaceremdvfnx and wbnuwdsbnbrAbstract Classwyoyurlb?gsuwpb
Related To: OOPQ44qN1dL:
egdWhat is difference between dufconstantcfdww and wdsmreadonlyhbh?hity
constantcfdww and wdsmreadonlyhbh?hityQ45oct:
wdzdExplain ndfldnpvpcAnonymous typeunqjtjyhpr in C#hqissxh
Q46SzzY:
lpthIs there a difference between olythrownre and pyithrow exroitja?ktjaw
thrownre and pyithrow exroitja?ktjawQ47aB9:
gxzExplain wykcjofqjjCode Compilationyvegfmbicf in C#vxvi
Q483bNFb:
hqjnuWhat is the difference between Equality Operator (ujqj==avdzjxk) and jlwbEquals()rww Method in C#?jdd
==avdzjxk) and jlwbEquals()rww Method in C#?jddQ49egX8J:
rcyhhbfWhat are the uses of yrnausingasx in C#gtu
usingasx in C#gtuQ50JnJ:
vieziemWhat is the difference between rajdxpdynamic typehyimcb variables and mtodyvnvyybobject typenriozdjhycha variables?ubowrq
Q51BXRh:
bqvkgWhat is zjfhxdlghakqVirtual Methodmuaawos in C#?eqbf
Q52Bgdls:
Related To: OOP
xlliaWhat is the difference between eodqlkatxstVirtualclapkimcoxuao method and ozhxloafnAbstractenhymqwmv method?cixlkv
Related To: OOPQ537ooJ:
hnookrbWhat is scope of a rfcxilsherpmcjInternalgslefzzxvy member variable of a C# class?otd
Q54i4B:
pvjo What is ciiiitkfnlxmExtension Methodqtxzwdvjli in C# and how to use them?kqy
Q557wX0:
qjsavWhat is the difference between utfjprefwha and brslvnoutzjahi keywords?ylnw
refwha and brslvnoutzjahi keywords?ylnwQ56wHWJ:
gjsbfiCan you create a function in C# which can accept varying number of arguments?vdncs
Q57oVT:
comafxWhat are pointer types in C#?nxme
Q58fPYB:
tfivlWhat is the difference between hvuqdisposesxhynjt and oamcskffinalizeogi methods in C#?qyd
disposesxhynjt and oamcskffinalizeogi methods in C#?qydQ59tIu:
mpyzWhat's the difference between rmfdhfStackOverflowErrorxxpnqtx and emgwOutOfMemoryErrorxpeny?aoqcazw
StackOverflowErrorxxpnqtx and emgwOutOfMemoryErrorxpeny?aoqcazwQ60ricnr:
gdcgWhat is wjzmxmjyujkIndexerddrikjnawm in C#?aycdy
Q61q86t:
glwWhat is the difference between bohFunc<string,string>mejrrfk and lnrlwahdelegateejqnf?bwuczkm
Func<string,string>mejrrfk and lnrlwahdelegateejqnf?bwuczkmQ62USWIM:
ogyqxtExplain what is lkfqcdbpvkShort-Circuit Evaluationkkorvjtiw in C#uizcq
Q64A9P:
yamWhat is the best practice to have best performance using Lazyagac
Q67PzYFa:
Related To: .NET Core
bsutbatExplain how does Asynchronous tasks kmonAsync/Awaitnfsfps work in .NET?awwumoj
Related To: .NET CoreAsync/Awaitnfsfps work in .NET?awwumojQ68SygN:
irpewxfWhat happens when we emxsbkxxgBoxtqkofsvvrr or dousjmqbedryUnboxdnevkxgvbkhpzk Nullable types?rrdhxvj
Q69JBa8w:
pyiobvpCan you explain the difference between peaxuInterfacemjrqyng, jfmqdowabstractqtzmdc class, ljlxnplsealedyusneb class, aybstaticzcnmhg class and psjspartialxkn class in C#?usglvzq
Interfacemjrqyng, jfmqdowabstractqtzmdc class, ljlxnplsealedyusneb class, aybstaticzcnmhg class and psjspartialxkn class in C#?usglvzqQ71TjcVN:
CSPY Related To: Fibonacci Series
wibjucTest if a Number belongs to the Fibonacci Seriesordlvs
CSPY Related To: Fibonacci SeriesQ725Shi:
nrwyoWhat is the zwtsmyieldbgkck keyword used for in C#?oxhxws
yieldbgkck keyword used for in C#?oxhxwsQ73imS:
sahnmWhat is wuapzaenxMarshallingmvjcfrh and why do we need it?ncvmtg
Q74N67q:
pvzWhat interface should your data structure implement to make the psbWheremupra method work?lwwzaq
Wheremupra method work?lwwzaqQ75cPU:
zdalkueIs tjjjmwwcrzoperator overloadingcgbwvzufyh supported in C#?ipdfvnn
Q76Pwych:
lseWhat is the difference between crySystem.ApplicationExceptionujaa class and irfSystem.SystemExceptionnrmgf class?uljki
System.ApplicationExceptionujaa class and irfSystem.SystemExceptionnrmgf class?uljkiQ7717WZ:
oczbWhy to use heflockqxxhat statement in C#?kvohax
lockqxxhat statement in C#?kvohaxQ78fpX:
jjfiCan wsqinzcjvsogjMultiple Inheritanceeolwlva implemented in C# ?yrefpyh
Q79sZYMx:
rpsrjpqWhat are the different ways a method can be overloaded?emc
Q80gaeL:
IEnumerablemhhei vs qirktrListeuwdwo - What to Use? How do they work?eiviz
IEnumerablemhhei vs qirktrListeuwdwo - What to Use? How do they work?eivizQ815xH9:
fwhgabtWhat is the awygwoofbgsmvConstructor Chainingjilyccyml in C#?dihtum
Q82PvLK:
musWhat is difference between zqnttyhlate bindingbnyajmxrf and eqvzqfvqearly bindinghxbkjoda in C#?gty
Q83qydWi:
rfeWhen would you use delegates in C#?vmnnggo
Q84AQRxw:
dntuoqbWhat is the use of conditional preprocessor directive in C#?hlf
Q852LTuD:
ckuWhat is the difference between urtywisian and xabaspliayzo operators in C#?lui
isian and xabaspliayzo operators in C#?luiQ86sEGi:
tedjWhat is scope of a Protected Internal member variable of a C# class?lut
Q87cWJ50:
garWhen to use movArrayListaydfvo over sqybeharray[]etb in C#?pssx
ArrayListaydfvo over sqybeharray[]etb in C#?pssxQ88N5vH:
amdkniWhat is fujzajtmanjagged arraynohztjhdce in C# and when to prefer jagged arrays over multi-dimensional arrays?lkxihza
Q89345C:
racvavyWhat is the method jwlvMemberwiseClone()hdahih doing?ptkjeo
MemberwiseClone()hdahih doing?ptkjeoQ9073Jf:
jhcqjoWhat is the difference between kenjmiifhavizLambdashorxcph and lqcaddrkxxszDelegatespqcqai?lwjs
Q91BENp:
jebxdqList some different ways for equality check in .NETrpmax
Q92T32N:
Related To: LINQ
sozWhat are the benefits of a ruzbaaajnmgDeferred Executiongtlmdfwucow in LINQ?svc
Related To: LINQQ93sQjY:
tmvuszmWhat's the difference between the jurzSystem.Array.CopyTo()akylb and jdocugrSystem.Array.Clone()ejpa?qtloac
System.Array.CopyTo()akylb and jdocugrSystem.Array.Clone()ejpa?qtloacQ94Fvg8j:
Related To: .NET Core
lyjjfxiExplain when to use jrjcoFinalizeroorw vs nwoDisposearlrlj?ghrjfz
Related To: .NET CoreFinalizeroorw vs nwoDisposearlrlj?ghrjfzQ95Odd89:
Related To: OOP
ecwwnzWhy doesn't C# allow gcakwpksmsbstatic methodssntopyx to implement an evunhggalwhjinterfaceoquwgml?fuis
Related To: OOPQ96xpw:
adgxhWhat are jgacoinCircular Referencesmvufugynd in C#?ltguqfa
Q97c8j:
vinfpqmWhat is the use of hpysstatichwcu constructors?wzlzqhl
statichwcu constructors?wzlzqhlQ9860Csy:
Related To: OOP
qukwwYou have defined a rowopgminndgnxdestructorxuozisjapm in a class that you have developed by using the C#, but the destructor pdvuvirubwbpwonever executedgkntvbsiau. Why?mne
Related To: OOPQ99tKUh:
lnwgaqsWhat is hrfldrywMulticast Delegateardozymnlgh in C#?rhpqfar
Q1006nlio:
cvknWhat are the differences between uiddfIEnumerablehtl and llgkncIQueryablenltjteo?hbgqsy
IEnumerablehtl and llgkncIQueryablenltjteo?hbgqsyQ101UjZ:
lmlqlxjExplain the difference between lmroruyIQueryablerehtyxo, ufeumsuICollectionhjphnaa, afwycbtIListlzvo & vjkzjpIDictionarypal interfaces?adewaj
IQueryablerehtyxo, ufeumsuICollectionhjphnaa, afwycbtIListlzvo & vjkzjpIDictionarypal interfaces?adewajQ1028npT:
rxbxWhat is ravsgspxvsdeepymdachoidc or ixfuyljshallowjppgvkba copy concept in C#?lbn
Q1037D8:
vzpqWhy Abstract class can not be sealed or static?ilrnyeb
Q104Rqj6:
whbImplement the bcfeWherehxplukk method in C#. Explain.yal
Wherehxplukk method in C#. Explain.yalQ105TBB:
bfdkcar in C#, when should we use abstract classes instead of interfaces with extension methods?dicmwh
Q1063Lks:
iiaouCan you add extension methods to an existing static class?asvdv
Q107Qh04:
txopzCould you explain the difference between ihbjFuncvcfclsv vs. vvgoiActiontjhuz vs. uulrczpPredicatehabdk?xbvnmpr
Funcvcfclsv vs. vvgoiActiontjhuz vs. uulrczpPredicatehabdk?xbvnmprQ108hOtmd:
uwdExplain what is sweiuqepgWeak Referenceumnjllmmzhn in C#?zoanm
Q109sRw:
jpfqiCould you explain the difference between krgsqwqdestructorfbmn, yzvdnhqdisposeqyt and kiinovfinalizefvljxeh method?kpd
destructorfbmn, yzvdnhqdisposeqyt and kiinovfinalizefvljxeh method?kpdQ110Hezz:
uzkvWhat is the ulervolatilexrgac keyword used for?gys
volatilexrgac keyword used for?gysQ111Rkzyu:
txexqaWhat is a zvltnglrridbaepreprocessor directivesizagjjz in C#?blpgkh
Code Challenges
Q2i0H:
CSJSJavaPY Related To: Queues, Stacks, Java, JavaScript
jvsImplement a Queue using two Stackstxzn
CSJSJavaPY Related To: Queues, Stacks, Java, JavaScriptQ34zY:
dkqWhat is the output of the program below? Explain.ryh
Q42s4KS:
CSPY Related To: Binary Tree, Data Structures
ncoylCan you do gwiyxihbtqIterative Pre-order Traversalcstaxelsynv of a rheyfrufjBinary Treeaujsjckqwfinw without tedizjxshpcRecursionuiapik?hka
CSPY Related To: Binary Tree, Data StructuresQ5mOl:
rqynCan you return multiple values from a function in C#? Provide some examples.yyifho
Q6GgF:
vnnGiven an array of ints, write a C# method to total all the values that are even numbers.rrqn
Q78pIJ:
avuquibRefactor the codeolmxamq
Q10fN6AL:
CSJavaPY Related To: Strings, Data Structures, Java
bpopaHow to check if two Strings (words) are zesmrihjfqAnagramsoienblploqz?uva
CSJavaPY Related To: Strings, Data Structures, JavaQ11CxO:
txajkmqWhat is the output of the short program below? Explain your answer.yagjkl
Q12GVq:
CSJSJavaPY Related To: Divide & Conquer, Fibonacci Series, Searching, Data Structures, JavaScript
ktqtExplain what is emlfmrjxftwyFibonacci Searchsopwrieb technique?vpm
CSJSJavaPY Related To: Divide & Conquer, Fibonacci Series, Searching, Data Structures, JavaScriptQ13gxvV:
vifhiIs relying on && short-circuiting safe in .NET?efeeo
Q14zDV:
CSJavaPY Related To: Linked Lists
aocpFind Merge (Intersection) Point of Two Linked Listsolpuvt
CSJavaPY Related To: Linked ListsQ15Ewb1:
CSJSJavaPY Related To: Fibonacci Series, Data Structures, JavaScript
zkaBinet's formula: How to calculate Fibonacci numbers without Recursion or Iteration? hvaxxnv
CSJSJavaPY Related To: Fibonacci Series, Data Structures, JavaScriptQ16TafQ:
yvvyWhat is the output of the program below? Explain your answer.mjv
Q17ci1wC:
afamWhat is the output of the program below?loqia
Q18ys7N:
gqwIs the comparison of time and null in the if statement below valid or not? Why or why not?dfp
Q19PXiT:
ktodavCalculate the circumference of the circleljws
Rust has been Stack Overflow’s most loved language for four years in a row and emerged as a compelling language choice for both backend and system developers, offering a unique combination of memory safety, performance, concurrency without Data races...
Clean Architecture provides a clear and modular structure for building software systems, separating business rules from implementation details. It promotes maintainability by allowing for easier updates and changes to specific components without affe...
Azure Service Bus is a crucial component for Azure cloud developers as it provides reliable and scalable messaging capabilities. It enables decoupled communication between different components of a distributed system, promoting flexibility and resili...
Cosmos DB has gained popularity among developers and organizations across various industries, including finance, e-commerce, gaming, IoT, and more. Follow along and learn the 24 most common and advanced Azure Cosmos DB interview questions and answers...
More than any other NoSQL database, and dramatically more than any relational database, MongoDB's document-oriented data model makes it exceptionally easy to add or change fields, among other things. It unlocks Iteration on the project. Iteration f...
Unit Tests and Test Driven Development (TDD) help you really understand the design of the code you are working on. Instead of writing code to do something, you are starting by outlining all the conditions you are subjecting the code to and what outpu...
Domain-Driven Design is nothing magical but it is crucial to understand the importance of Ubiquitous Language, Domain Modeling, Context Mapping, extracting the Bounded Contexts correctly, designing efficient Aggregates and etc. before your next DDD p...
At its core, Microsoft Azure is a public cloud computing platform - with solutions including Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS) that can be used for services such as analytics, virtual c...
As an asynchronous event-driven JavaScript runtime, Node.js is designed to build scalable network applications. Follow along to refresh your knowledge and explore the 52 most frequently asked and advanced Node JS Interview Questions and Answers every...
Dependency Injection is most useful when you're aiming for code reuse, versatility and robustness to changes in your problem domain. DI is also useful for decoupling your system. DI also allows easier unit testing without having to hit a database and...
FullStack.Cafe is a biggest hand-picked collection of top Full-Stack, Coding, Data Structures & System Design Interview Questions to land 6-figure job offer in no time.
Coded with 🧡 using React in Australia 🇦🇺
by @aershov24, Full Stack Cafe Pty Ltd 🤙, 2018-2023
Privacy • Terms of Service • Guest Posts • Contacts • MLStack.Cafe
Great 
based on 86 Trustpilot 
Reviews
based on 86 Trustpilot Reviews