QUESTPOND ONLINE COURSE

.NET / C# Interview Questions with Answers

What you'll learn

  • Understanding what kind of fundamental questions are asked in C# and .NET interviews and how to clear them.
  • Answering fundamental C# questions around .NET Core vs .NET Framework, IL Code, JIT, CTS, CLS, CLR and Garbage Collector.
  • How to confidently answer questions around Stack, Heap, Value Types, Reference Types, Boxing and Unboxing.
  • Threading and collections interview questions including Array, ArrayList and Generics.
  • Delegates and Events and how to answer their differences.
  • OOP interview questions covering Classes, Objects, Polymorphism, Inheritance, Virtual Methods and Abstract Classes.

Course Curriculum

Explore the topics covered in this course.

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Questions on Stack, Heap, Boxing, Unboxing, Array, ArrayList, Generics, Threading. Click to view syllabus
Module 1

Question 1 :- Explain difference between .NET and C# ?
Question 2 :- .NET Framework vs .NET Core vs .NET 5.0
Question 3 :- What is IL ( Intermediate Language) Code ?
Question 4 :- What is the use of JIT ( Just in time compiler) ?
Question 5 :- Is it possible to view IL code ?
Question 6 :- What is the benefit of compiling in to IL code ?
Question 7 :- Does .NET support multiple programming languages ?
Question 8 :- What is CLR ( Common Language Runtime) ?
Question 9 :- What is managed and unmanaged code ?
Question 10 :- Explain the importance of Garbage collector ?
Question 11 :- Can garbage collector claim unmanaged objects ?
Question 12 :- What is the importance of CTS ?
Question 13 :- Explain CLS ?
Question 14 :- Difference between Stack vs Heap ?
Question 15 :- What are Value types & Reference types?
Question 16 :- Explain boxing and unboxing ?
Question 17 :- What is consequence of boxing and unboxing ?
Question 18 :- Explain casting, implicit casting and explicit casting ?
Question 19 :- What can happen during explicit casting ?
Question 20 :- Differentiate between Array and ArrayList ?
Question 21 :- Whose performance is better array or arraylist ?
Question 22 :- What are generic collections ?
Question 23 :- What are threads (Multithreading)?
Question 24 :- How are threads different from TPL ?
Question 25 :- How do we handle exceptions in C#(try/catch)?
Question 26 :- What is the need of finally?
Question 27 :- Why do we need the out keyword ?
Question 28 :- What is the need of Delegates ?
Question 29 :- What are events ?
Question 30 :- Whats the difference between Abstract class and interface ?

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Questions on Delegates, Event & Delegates vs Events. Click to view syllabus
Module 2

Question 31 - What is a Delegate and how to create a Delegate?Question 32 - Where have you used Delegates?
Question 33 - What is a Multicast Delegates?
Question 34 - What is an Event?
Question 35 - How to Create an Event?
Question 36 - Delegate VS Events.

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Questions OOP, Abstraction, Encapsulation, Inheritance, Virtual, Overriding and overloading. Click to view syllabus
Module 3

Question 37 :- Why do we need OOP ?
Question 38 :- What are the important pillars of OOPs ?
Question 39 :- What is a class and object ?
Question 40 :- Abstraction vs Encapsulation?
Question 41 :- Explain Inheritance ?
Question 42 :- Explain virtual keyword ?
Question 43 :- What is overriding ?
Question 44 :- Explain overloading ?
Question 45 :- Overloading vs Overriding ?

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Questions Polymorphism, Static vs Dynamic polymorphism and operator overloading. Click to view syllabus
Module 4

Question 44 :- What is polymorphism ?
Question 45 :- Can polymorphism work with out inheritance ?
Question 46 :- Explain static vs dynamic polymorphism ?
Question 47 :- Explain operator overloading ?

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Tricky Questions around Abstract classes and Interfaces. Click to view syllabus
Module 5

Question 48 :- Why do we need Abstract classes ?
Question 49 :- Are Abstract methods virtual ?
Question 50 :- Can we create a instance of Abstract classes ?
Question 51 :- Is it compulsory to implement Abstract methods ?
Question 52 :- Why simple base class replace Abstract class ?
Question 53 :- Explain interfaces and why do we need it ?
Question 54 :- Can we write logic in interface ?
Question 55 :- Can we define methods as private in interface ?Question 56 :- If i want to change interface what's the best practice ?
Question 57 :- Explain Multiple inheritance in Interface ?
Question 58 :- Explain Interface Segregation principle ?
Question 59 :- Can we create instance of interface ?
Question 60 :- Can we do Multiple inheritance with Abstract classes ?

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Answering the most asked Question "Abstract classes vs Interface". Click to view syllabus
Module 6
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Questions around constructors & in parent child which constructor fires first. Click to view syllabus
Module 7

Question 62 :- Why do we need constructors ?
Question 63 :- In parent child which constructor fires first ?
Question 64 :- How are initializers executed ?
Question 65 :- How are static constructors executed in Parent child ?
Question 66 :- When does static constructor fires ?

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Questions around Shadowing, Sealed, Nested classes and partial classes. Click to view syllabus
Module 8

Question 70 :- What is Shadowing?
Question 71 :- Explain method hiding?
Question 72 :- Shadowing vs Overriding ?
Question 73 :- When do we need Shadowing ?
Question 74 :- Explain Sealed Classes ?
Question 75 :- Can we create instance of sealed classes ?
Question 76 :- What are nested classes and when to use them ?
Question 77 :- Can Nested class access outer class variables ?
Question 78 :- Can we have public, protected access modifiers in nested class ?
Question 79 :- Explain Partial classes ?
Question 80 :- In What scenarios do we use partial classes ?

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Questions Around SOLID principles , Dependency injection (DI) and Inversion of Control(IOC) Click to view syllabus
Module 9

Question 81 :- What is SOLID ?
Question 82 :- What is the full form of SOLID ?
Question 83 :- What is the goal of SOLID ?
Question 84 :- Explain SRP with A example ?
Question 85 :- What is the benefit of SRP ?
Question 86 :- Explain OCP with a example ?
Question 87 :- What is the benefit of OCP ?
Question 88 :- Can you explain LISKOV Principle and it's violation?
Question 89 :- How can we fix LISKOV Problem ?
Question 90 :- Explain Interface Segregation Principle ?
Question 91 :- Is there a connection between LISKOV and ISP ?
Question 92 :- Define dependency inversion ?
Question 93 :- What is higher level module and lower level module ?
Question 94 :- How does dependency inversion benefit, show with an example ?
Question 95 :- Will only Dependency inversion solve decoupling problem ?
Question 96 :- Why do developers move object creation outside high lever module ?
Question 97 :- Explain IOC ( Inversion of Control) ?
Question 98 :- Explain Dependency Injection with an example ?
Question 99 :- Is SOLID, IOC and DI design pattern or Principle?
Question 100 :- Is only SOLID Enough for good code/ architecture ?

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Explain & Differentiate Composition, Aggregation and Association in C#. Click to view syllabus
Module 10

Question 101 :- What are the different types of "USING/HAS A" relationship ?
Question 102 :- What is a composition relationship ?Question 103 :- Explain Aggregation ?
Question 104 :- Explain Association ?
Question 105 :- Differentiate between Composition vs Aggregation vs Association ?
Question 106 :- UML Symbols for Composition, Aggregation and Association