C# Interview Questions and Answers List
Are you preparing for the C# Interview? If yes, then you are at the right place. This is the C# Interview Questions and Answers article series. Here we will see the Top 150+ C# Interview Questions with Answers.
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Introduction
I have already posted all the C# Interview Questions and Answers article series. Here we will see the C# Interview Questions Summary and the particular part link so that you can walk through the answer to the particular interview question directly.
Please read the following important Interview Questions and Answers article series list here:
C# Interview Questions And Answers List
Q001. What are the 4 pillars of OOPS?
Q002. What is the difference between Abstraction vs Encapsulation?
Q003. What is the difference between Class vs Structure in C#?
Q004. What are the different Access Modifiers in C#?
Q005. What is Polymorphism in C#? What are the different types of Polymorphism?
Q006. What are the different ways to implement Polymorphism in C#?
Q007. What is the difference between Early Binding vs Late Binding in C#? or What is the difference between Compile Time Polymorphism vs Run-Time Polymorphism in C#?
Q008. What is Shadowing in C#? or What is the Method Hiding in C#? How can you achieve that?
Q009. What is the abstract method? How an abstract method is different from a virtual method?
Q010. What is the difference between Overloading vs Overriding in C#?
Q011. Can you achieve method overloading by inheritance? How?
Q012. Can you overload the main() method in C#?
Q013. Can you achieve method overriding without inheritance, how?
Q014. What is the difference between Method Overriding vs Method Hiding?
Q015. We have two methods, one is returning IEnumerable results and the second one is void. Is it an example of Static Polymorphism?
Q016. What is Constructor Overloading in C#? Can you overload a static constructor in C#?
Q017. What is the difference between a virtual method vs abstract method?
Q018. What is the difference between inheritance vs composition? Why Composition is immune to Fragile Base Class Problem?
Q019. How can you achieve composition with the abstract classes?
Q020. What happens if the inherited interfaces have conflicting method names?
Q021. What is the Fragile Base Class Problem (FBCP) of OOPS? How can you avoid this problem?
Q022. What is an abstract class? Can an abstract class implement an interface?
Q023. When do you choose interface over an abstract class or vice versa?
Q024. Can you define constructors in the abstract class? What is the use of a constructor in an abstract class that can not be instantiated?
Q025. Can you create the object of the abstract class? Is it mandatory to have abstract members in the abstract class?
Q026. What is the difference between abstract class vs interface?
Q027. Does C# support multiple inheritances? Why?
Q028. What is the Diamond Problem in OOPS?
Q029. What is the difference between class inheritance vs interface inheritance in C#?
Q030. What is the difference between multiple vs multilevel inheritances?
Q031. What is the order of constructor execution in the case of inheritance?
Q032. What is the order of static constructor execution in the case of inheritance?
Q033. Can two classes having different accessibility be inherited?
Q034. What is the static class? Can a static class implement interface, why?
Q035. What is the difference between a static class and an instance class having all members as static?
Q036. Can you inherit a class in a structure in C#? Why?
Q037. What is the difference between structure vs class in C#?
Q038. Can you define a destructor in a structure? Why?
Q039. Can a structure have protected members? Why?
Q040. What is the difference between static class and instance class?
Q041. What is the difference between static class vs singleton?
Q042. What is the use of static class? Can you give me some real examples of static classes and static methods available in the .Net?
Q043. What is a partial class in C#? What is the use of partial class, do you have any real examples?
Q044. What is a partial method in C#? What is the use of partial methods?
Q045. Can you give me some real examples or use of partial classes and partial methods available in the .Net?
Q046. What is the difference between int vs Int32 in C#?
Q047. What is the difference between string vs String? or What is the difference between string keyword and System.String class in C#?
Q048. What is the difference between String vs StringBuilder in C#?
Q049. What do you understand by the term 'TypeSafe'? Is C# a typesafe language?
Q050. What are Tuples in C#? What is its main use of it?
Q051. What is the difference between value type vs reference type?
Q052. What is the difference between reference type vs pass-by-reference?
Q053. What is the difference between OUT vs REF type parameters?
Q054. Can you pass a constant as a reference? Why?
Q055. If a method's return type is void, can you use a return statement in the method? What is the use of the return keyword?
Q056. What is a recursive method? Can you tell me any available recursive method names in C#?
Q057. In C# strings are the value type or reference type? How?
Q058. Enums are value type or a reference type in C#?
Q059. In C#, the structure is a value type or a reference type?
Q060. What is the difference between casting vs conversion in C#?
Q061. What is the difference between boxing vs unboxing in C#?
Q062. What is the difference between boxing vs conversion in C#?
Q063. What is the difference between unboxing vs casting?
Q064. What is the difference between int.Parse(), int.TryParse() and Convert.ToInt32() methods?
Q065. What is the difference between .ToString() and Convert.ToString() in C#?
Q066. What is the difference between String.IsNullOrEmpty() vs String.IsNullOrWhiteSpace() in C#?
Q067. What is a sealed class in C#? Can you make the abstract class sealed?
Q068. What is the sealed method in C#? How can you make any method sealed?
Q069. What is the difference between the sealed method vs the private method in C#?
Q070. What is the difference between Sealed Class vs Abstract Class in C#?
Q071. What is the difference between Sealed Class and Static Class in C#?
Q072. How a sealed class is different from a class having a private constructor in C#?
Q073. What is a destructor? How does it affect the garbage collection process? When should we define destructor in C#?
Q074. When the destructor is called? Can you pass parameters to destructors? How many destructors can be defined in a class?
Q075. What is garbage collection in C#? What are the different generations of GC? Why different GC Generations Required?
Q076. What is the difference between Destructor vs Finalizer in C#?
Q077. What is the difference between IDisposable and Finalizer? or What is the difference between dispose and finalize method in C#?
Q078. Can a static class contain a destructor? Why?
Q079. What is the purpose of using statement or using block in C#? or What is the using dispose pattern?
Q080. What is the use of the Checked and UnChecked keywords in C#?
Q081. What is the difference between constant vs readonly in C#?
Q082. What is recursion? Which data structure is used by the recursion?
Q083. What is a delegate in C#? Can you tell me some common delegates available in C#?
Q084. What is the use of FUNC, PREDICATE, and ACTION delegates in C#?
Q085. What are the generics in C#, and why they are required? How can you define a generic class and methods in C#?
Q086. What is the difference between System.Collections and System.Collections.Generic namespaces?
Q087. What is the difference between an Array vs ArrayList in C#?
Q088. What’s the difference between the Array.CopyTo vs Array.Clone or Copy vs Clone in C#?
Q089. What is an indexer in C#? What is the difference between indexer and property?
Q090. What is the difference between debug vs release mode?
Q091. What are the different ways to handle the exceptions in C#? Can a try block exist without a catch block in C#?
Q092. What is the difference between IEnumerable vs IEnumerator in C#?
Q093. What is the difference between IEnumerable vs IQueryable in C#?
Q094. What is the difference between IEnumerable vs IList vs List in C#?
Q095. What is the use of the Params keyword in C#?
Q096. What is the difference between Equality Operator "==" vs .Equals() method comparison in C#?
Q097. What is a private constructor? What is the use of a private constructor?
Q098. What is a static constructor in C#? How can you call the static constructor?
Q099. What is the Constructor Chaining in C#? How it is different from Constructor Overloading?
Q100. Can you prevent a class from being instantiated? What are the different ways to do that?
Q101 What is Data Annotation in C#? How can you do remote validation using it?
Q102. What is Reflection? What is the use of reflection in C#?
Q103. What is LINQ in C#?
Q104. What is Extension Method in C#? What is the difference between the Extension Method vs Overloaded Method vs Overridden Method?
Q105. What are Anonymous Types in C#? How it is different from dynamic types?
Q106. What is the difference between dynamic vs var type in C#?
Q107. What is the difference between the “throw” vs “throw ex” in .NET?
Q108. What is finally block? How many finally blocks can you define with a try block?
Q109. What will happen if the finally block throws an exception?
Q110. What is the difference between the IS vs AS Operators in C#?
Q121. What is the difference between Final, Finally, and Finalize?
Q122. What is the difference between First() vs FirstOrDefualt() in C#? What is the difference between First() vs Single()?
Q123. What is the volatile keyword? What is the use of volatile keywords in C#?
Q124. What is the difference between Deferred Execution vs Immediate Execution? or What is the difference between Lazy Operators vs Greedy Operators?
Q125. What is the difference between Lazy Loading vs Early Loading in C#?
Q126. What is the difference between Late Binding vs Lazy Loading? Are both the same?
Q127. What is the difference between Early Binding vs Early Loading? Are both the same?
Q128. What is the difference between "this" vs "base" keyword in C#?
Q129. What is the difference between foreach vs for loop in C#?
Q130. What is the difference between instance field vs property in the C# class?
Q131. What is TPL in the .Net? Why TPL is required in C#?
Q132. What is the difference between ForEach vs Parallel.ForEach loop in C#?
Q133. What is the difference between Standard For Loop vs Parallel.For Loop in C#?
Q134. What is the difference between task vs process vs thread?
Q135. What is Multi-threading? What is the difference between Multi-threading vs MultiTasking and Multi-threading vs Concurrency?
Q136. What is the difference between Concurrency vs Parallelism? Are they same as async programming?
Q137. What is asynchronous programming? What is the use of async and await keywords in C#?
Q138. What is a Task in C#? What is the difference between task vs thread?
Q139. What is synchronization and why it is important?
Q140. What is the difference between Join vs Lock synchronization?
Q141. What is the difference between Mutex vs Monitor?
Q142. What is Semaphore C#? How does the Semaphore work?
Q143. What is deadlock? How can you prevent deadlock in C#?
Q144. What do you mean by thread-safe? How can you share data between multiple threads?
Q145. How can you retrieve data from a thread? What is a callback method?
Q146. What is Anonymous Method in C#?
Q147. What is Lambda Expression in C#?
Q148. What is a thread? What is the thread life cycle or different states of a thread?
Q149. What is the difference between task.wait() vs task.delay() vs thread.sleep() in C#?
Q150. What is string interpolation in C#?
Q151. What is the difference between generic vs non-generic collections? Why do we need generic collections?
Q152. What is ArrayList? What is the difference between Array vs ArrayList?
Q153. What is Dictionary? What is the difference between a List vs Dictionary?
Q154. What is HashTable? What is the difference between HashTable vs Dictionary?
Q155. What is Stack? What are the applications of Stack? What is the difference between Peek() vs Pop() operations?
Q156. What is Queue? What are the applications of Queue? What is the difference between Dequeue() vs Peek() operation?
Q157. What is Heap? What are the applications of Heap?
Q158. What is Linked List in C#?
Q159. What is the difference between class vs object?
Q160. What is the use of optional parameters? Can you overload two methods based on optional Parameters?
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