Overview

If you are looking to clear C# and.NET Interviews then you have landed at the right course. You can be a hero in your project/company , you must have handled complex scenarios. But failing to answer simple.NET , C# Fundamental question during interview can lead to a very negative impact during interviews. This course focuses on Fundamental questions around C# and.NET.Happy job hunting.Below is the list of C# interview questions covered in the Series. Part 1 - Stack, Heap, Boxing, Unboxing, Array, ArrayList, Generics, ThreadingQuestion 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:- What's the difference between Abstract class and interface ?Part 2 - Questions on Delegates, Event and Delegates vs Events.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 a Event ?Question 35 :- How to create a event ?Question 36 :- Delegate vs Events.Part 3 - OOP, Abstraction, Encapsulation, Inheritance, Overriding & overloading.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 ?Part 4 - Polymorphism, Static vs Dynamic polymorphism and operator overloading.Question 46:- What is polymorphism ?Question 47:- Can polymorphism work with out inheritance ?Question 48:- Explain static vs dynamic polymorphism ?Question 49:- Explain operator overloading ?Part 5 - Tricky Questions around Abstract classes and Interfaces.Question 50 :- Why do we need Abstract classes ?Question 51 :- Are Abstract methods virtual ?Question 52 :- Can we create a instance of Abstract classes ?Question 53 :- Is it compulsory to implement Abstract methods ?Question 54 :- Why simple base class replace Abstract class ?Question 55 :- Explain interfaces and why do we need it ?Question 56 :- Can we write logic in interface ?Question 57 :- Can we define methods as private in interface ?Question 58 :- If i want to change interface what's 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 ?Part 6 - Answering the most asked Question "Abstract classes vs Interface".Question 63:- Difference between Abstract Class & Interfaces?Part 7 - Questions around constructors & parent child constructor.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 ?Part 8 - Questions around Shadowing, Sealed, Nested classes and partial classes.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 ?Part 9 - Questions Around SOLID principles , Dependency injection (DI) and IOCQuestion 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 ?Part 10- Explain & Differentiate Composition, Aggregation and Association in C#.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 AssociationPart 11 - Crack questions on Stack, Heap, Boxing, Unboxing, Value & reference typesQuestion 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 ?Part 12 - What is Garbage collector, Managed vs UnManaged code, Dispose Pattern, Memory Leaks, weak VS strong references ?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 ?Lesson 13:- Questions around Design Pattern Basics, Types, Singleton Pattern, Prototype, Template and Adapter.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?Lesson 14:- Repository Pattern and Unit of Work Design Pattern Interview Questions.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?Lesson 15:- Most asked Factory Pattern, DI and IOC Interview Questions.Question 172:- What is Factory pattern and how does it benefit?Question 173:- How does centralizing object creation helps in loose coupling ?Question 174:- What is IOC and DI ?Question 175:- DI vs IOC ?Question 176:- What is a service locator ?Question 177:- Service Locator vs DI ?Question 178:- Which is good to use Service Locator or DI ?Question 179:- Can not we use a simple class rather than interface for DI ?Question 180:- Is DI a Factory Pattern?Question 181:- So If you just centralize object creation is it Factory pattern?Question 182:- Static DI and Dynamic DI ?Question 183:- In which scenarios to use Static DI vs Dynamic DI ?Lesson 16:- The Real Factory and Abstract Factory Patterns.Question 184:- The real Factory pattern ?Question 185:- Factory Method vs Factory pattern ?Question 186:- How are new behaviors created in FP ? Question 187:- What is Abstract Factory Pattern ? Question 188:- Does Abstract Factory Pattern use FP inside ?Question 189:- Explain Simple Factory Pattern ?Question 190:- Simple Factory vs Factory (Factory Method) vs Abstract Factory ? Question 191:- How to remove IF conditions from Simple Factory?

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