C# Interview Questions and Answers
3+ Hours of Q&A Videos with Source Codes (Subscription Validity For 8 Months)
What you'll learn :-
C# is a type-safe and simple object-oriented programming language. This course covers 150 interview questions and answers ranging from basic to advanced C#. So, whether you're a beginner looking to become a C# developer or an experienced professional looking to switch job, you've arrived at the correct location.
Course Content
- 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 ?
- 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.
- 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 ?
- Question 46 :- Explain static vs dynamic polymorphism ?
- Question 47 :- Explain operator overloading ?
- 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 whats the best practice ?
- Question 59 :- Explain Multiple inheritance in Interface ?
- Question 60 :- Explain Interface Segregation principle ?
- Question 61 :- Can we create instance of interface ?
- Question 62 :- Can we do Multiple inheritance with Abstract classes ?
- Question 63 :- Abstract Class vs interface interview questions and answers.
- Question 64 :- Why do we need constructors ?
- Question 65 :- In parent child which constructor fires first ?
- Question 66 :- How are initializers executed ?
- Question 67 :- How are static constructors executed in Parent child ?
- Question 68 :- When does static constructor fires ?
- Question 69 :- What is Shadowing?
- Question 70 :- Explain method hiding?
- Question 71 :- Shadowing vs Overriding ?
- Question 72 :- When do we need Shadowing ?
- Question 73 :- Explain Sealed Classes ?
- Question 74 :- Can we create instance of sealed classes ?
- Question 75 :- What are nested classes and when to use them ?
- Question 76 :- Can Nested class access outer class variables ?
- Question 77 :- Can we have public,protected access modifiers in nested class ?
- Question 78 :- Explain Partial classes ?
- Question 79 :- In What scenarios do we use partial classes ?
- Question 80 :- What is SOLID ?
- Question 81 :- What is the full form of SOLID ?
- Question 82 :- What is the goal of SOLID ?
- Question 83 :- Explain SRP with A example ?
- Question 84 :- What is the benefit of SRP ?
- Question 85 :- Explain OCP with a example ?
- Question 86 :- What is the benefit of OCP ?
- Question 87 :- Can you explain LISKOV Principle and it's violation?
- Question 88 :- How can we fix LISKOV Problem ?
- Question 89 :- Explain Interface Segregation Principle ?
- Question 90 :- Is there a connection between LISKOV and ISP ?
- Question 91 :- Define dependency inversion ?
- Question 92 :- What is higher level module and lower level module ?
- Question 93 :- How does dependency inversion benefit, show with an example ?
- Question 94 :- Will only Dependency inversion solve decoupling problem ?
- Question 95 :- Why do developers move object creation outside high lever module ?
- Question 96 :- Explain IOC ( Inversion of Control) ?
- Question 97 :- Explain Dependency Injection with an example ?
- Question 98 :- Is SOLID, IOC and DI design pattern or Principle?
- Question 99 :- Is only SOLID Enough for good code/ architecture ?
- Question 100 :- What are the different types of "USING/HAS A" relationship ?
- Question 101 :- What is a composition relationship ?
- Question 102 :- Explain Aggregation ?
- Question 103 :- Explain Association ?
- Question 104 :- Differentiate between Composition vs Aggregation vs Association ?
- Question 105 :- UML Symbols for Composition, Aggregation and Association
- Question 106 :- Explain stack and Heap ?
- Question 107 :- Where are stack and heap stored ?
- Question 108 :- What goes on stack and what goes on heap ?
- Question 109 :- How is the stack memory address arranged ?
- Question 110 :- How is stack memory deallocated LIFO or FIFO ?
- Question 111 :- How are primitive and objects stored in memory?
- Question 112 :- Can primitive data types be stored in heap ?
- Question 113 :- Explain value types and reference types ?
- Question 114 :- Explain byval and byref ?
- Question 115 :- Differentiate between copy byvalue and copy byref ?
- Question 116 :- What is boxing and unboxing ?
- Question 117 :- Is boxing unboxing good or bad ?
- Question 118 :- Can we avoid boxing and unboxing ?
- Question 119 :- What effect does boxing and unboxing have on performance ?
- Question 120 :- Are string allocated on stack or heap ?
- Question 121 :- How many stack and heaps are created for an application ?
- Question 122 :- How are stack and heap memory deallocated ?
- Question 123 :- Who clears the heap memory ?
- Question 124 :- Where is structure allocated Stack or Heap ?
- Question 125 :- Are structures copy byval or copy byref ?
- Question 126 :- Can structures get created on Heap ?
- Question 127: - Explain Garbage collector (GC)?
- Question 128:- How does Garbage collector know when to clean the objects ?
- Question 129 :- Is there a way we can see this Heap memory ?
- Question 130 :- Does Garbage collector clean primitive types ?
- Question 131: - Managed vs UnManaged code/objects/resources?
- Question 132:- Can garbage collector clean unmanaged code ?
- Question 133:- Explain Generations ?
- Question 134:- What is GC0,GC1, and GC2 ?
- Question 135:- Why do we need Generations ?
- Question 136:- Which is the best place to clean unmanaged objects ?
- Question 137:- How does GC behave when we have a destructor ?
- Question 138:- What do you think about empty destructor ?
- Question 139:- Explain the Dispose Pattern?
- Question 140 :- Finalize vs Destructor ?
- Question 141:- What is the use of using keyword ?
- Question 142:- Can you force Garbage collector ?
- Question 143:- Is it a good practice to force GC ?
- Question 144:- How can we detect a memory issues ?
- Question 145:- How can we know the exact source of memory issues ?
- Question 146 :- What is a memory leak ?
- Question 147 :- Can .NET Application have memory leak as we have GC?
- Question 148:- How to detect memory leaks in .NET applications ?
- Question 149:- Explain weak and strong references ?
- Question 150 :- When will you use weak references ?
- Question 151:- What are design patterns?
- Question 152 :- Which are the different types of design patterns?
- Question 153 :- Explain structural , Behavioral and Creational design pattern ?
- Question 154:- Explain Singleton Pattern and the use of the same?
- Question 155:- How did you implement singleton pattern?
- Question 156:- Can we use Static class rather than using a private constructor?
- Question 157:- Static vs Singleton pattern?
- Question 158:- How did you implement thread safety in Singleton?
- Question 159:- What is double null check in Singleton?
- Question 160:- Can Singleton pattern code be made easy with Lazy keyword?
- Question 161:- Can we rid of this double null check code?
- Question 162:- What is the use of repository pattern?
- Question 163:- Is Dal (Data access Layer) and Repository same?
- Question 164:- What is Generic repository pattern ?
- Question 165:- Is abstraction the only benefit of Repository?
- Question 166:- How to implement transaction in repository?
- Question 167:- What is Unit of work design pattern?
- Question 168:- Do we need repository pattern as EF does almost the same work?
- Question 169:- Did you do unit testing with Repository ?
- Question 170:- How does repository pattern make unit testing easy?
- Question 171:- How can we do mock testing with Repository?
- C# interview questions with answers PDF(covers different questions than the videos).
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