Tech Point Fundamentals

Sunday, March 5, 2023

SQL Interview Questions and Answers List

interview-questions-list , SQL-Interview-Questions
SQL Interview Questions and Answers List

SQL Interview Questions and Answers List

sql-interview-questions-list

Are you preparing for the SQL Interview? If yes, then you are at the right place. This is the SQL Interview Questions and Answers article series. Here we will see the Top 100+ SQL Interview Questions with Answers.  

Please visit our YouTube Channel for Interviews and other videos by below link:



Introduction


I have already posted all the SQL Interview Questions and Answers article series. Here we will see the SQL 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 here: 






SQL Interview Questions And Answers List 



Part 01: https://www.techpointfunda.com/2022/03/sql-interview-part-01.html


Q01. What is Normalization in SQL?
Q02. What are the different Normal Forms (NF) in SQL?
Q03. What is DeNormalization and why do we need it?
Q04. What is the 8KB Page Concept in SQL?
Q05. What is the IAM Page in SQL?
Q06. What is Heap in SQL?
Q07. What is the difference between Table Scan vs Index Scan vs Index Seek?
Q08. What is Fragmentation or Index Fragmentation in SQL?






Part 02: https://www.techpointfunda.com/2022/03/sql-interview-part-02.html


Q09. What is the SQL Profiler?
Q10. What is SQL Server Agent?
Q11. What are the MASTER and TEMPDB databases? What is the use of these databases?
Q12. Which TCP/IP port does SQL Server run on? How can you change it?
Q13. What is a Linked Server? How can you create it?
Q14. What are the different authentication modes in SQL Server? What are the different SQL Login Types?
Q15. What is Collation in SQL? How does it affect the database?
Q16. What is the use of Statistics? Why the updation of statistics are important in SQL?







Q17. What is Constraint in SQL Server? What are the different types of Constraints available in SQL Server?
Q18. What is the Primary Key Constraint in SQL Server?
Q19. What is the difference between Primary Key vs Clustered Index?
Q20. What is the Unique Key Constraint in SQL Server?
Q21. What is the difference between Unique Key vs Unique Index?
Q22. What is the difference between Primary Key and Unique Key?
Q23. What is NOT NULL Constraint?
Q24. What is Default Constraint?






Part 04: https://www.techpointfunda.com/2022/03/sql-interview-part-04.html


Q25. What is CHECK Constraint in SQL Server?
Q26. What is Foreign Key Constraint in SQL Server?
Q27. How the Foreign Key works? or How the Foreign Key preserves the Referential Integrity?
Q28. What is the difference between Primary Key vs Foreign Key?
Q29. What is the difference between Foreign Key Constraint vs Check Constraint?
Q30. What is an index and what are the different types of indexes in SQL?
Q31. What is the difference between  Clustered Index vs Non-Clustered Index in SQL Server?
Q32. What is the difference between Constraint vs Index?







Q33. What is the difference between Unicode data types and Non-Unicode data types?
Q34. What is the difference between fixed-length data type and variable-length data type?
Q35. What is the difference between CHAR vs VARCHAR data types?
Q36. What is the difference between VARCHAR vs NVARCHAR data types?
Q37. What is the max size of a VARCHAR and NVARCHAR data type in SQL, Why? 
Q38. What is the difference between VARCHAR(MAX) and VARCHAR(n) data types?
Q39. What is the difference between VARCHAR(MAX) and TEXT(n) data types?
Q40. What is the difference between LEN() vs DATALENGTH() in SQL?
Q41. What is the difference between DateTime and DateTime2 data types in SQL?






Part 06: https://www.techpointfunda.com/2022/07/sql-interview-part-06.html


Q42. What is the difference between CAST vs. CONVERT in SQL?
Q43. What does it mean to have QUOTED_IDENTIFIER ON in SQL?
Q44. What does it mean to have ANSI_NULL ON or OFF in SQL?
Q45. What does it mean to have ANSI_PADDING ON or OFF in SQL?
Q46. What is the difference between GO and Semicolon(;) Statement Terminator in SQL?
Q47. What is NULL in SQL? What is the difference between NULL and UNKNOWN?
Q48. What is SQL Three Valued Logic? How does it affect the application logic?
Q49. What is the difference between ISNULL() vs COALESCE() function?







Part 07: https://www.techpointfunda.com/2022/07/sql-interview-part-07.html


Q50. What is the difference between DELETE vs TRUNCATE command?
Q51. What is the difference between the WHERE clause vs HAVING clause in SQL Server?
Q52. What is the difference between COUNT(*) vs COUNT(col) vs COUNT(1) in SQL?
Q53. What is the difference between UNION vs UNION ALL in SQL?
Q54. How can you get the last inserted record in SQL? OR What is the difference between @@IDENTITY, SCOPE_IDENTITY(), and IDENT_CURRENT() in SQL?
Q55. What is the difference between ROW_NUMBER() vs  RANK() vs DENSE_RANK() in SQL?
Q56. What is the main difference between IN() vs NOT IN() operators in SQL?
Q57. What is the difference between SQL INTERSECT vs EXCEPT operator?
Q58. What is the difference between IN() vs EXIST() operators?
Q59. What is the difference between NOT IN() vs NOT EXISTS() vs EXCEPT operator?







Part 08: https://www.techpointfunda.com/2022/07/sql-interview-part-08.html


Q60. What is SubQuery? What is the difference between Standalone SubQuery, Co-Related SubQuery, and Nested SubQuery in SQL?
Q61. What is a Temporary Table or Temp Table in SQL? What is the difference between Local Temp Table and Global Temp Table?
Q62. What is Derived Table or DT in SQL? How DT is different from Common Table Expression (CTE) in SQL?
Q63. What is Common Table Expression or CTE in SQL?
Q64. What is Table Variable? What is the difference between Table Variable and Temp Table in SQL?
Q65. What is Table-Valued Type? What is the difference between Table Variable and Table-Valued Type in SQL?
Q66. What is the difference between PIVOT and UNPIVOT Functions in SQL?
Q67. What is the CASE statement in SQL? Can you use the CASE statement in the WHERE clause?






Part 09: https://www.techpointfunda.com/2022/07/sql-interview-part-09.html


Q68. What is JOIN in SQL? What are the different types of join available in SQL?
Q69. What is INNER JOIN in SQL?
Q70. What is Self JOIN in SQL? How it is different from INNER JOIN?
Q71. What is LEFT JOIN in SQL? What is the difference between LEFT JOIN vs INNER JOIN?
Q72. What is RIGHT JOIN? What is the difference between RIGHT JOIN and LEFT JOIN in SQL?
Q73. What is FULL JOIN in SQL?
Q74. What is CROSS JOIN in SQL? What is the use of Cross Join?
Q75. What is the difference between FULL JOIN vs CROSS JOIN in SQL?
Q76. What is the difference between ON Clause vs WHERE clause in SQL?
Q77. What is the difference between INNER JOIN vs IN() clause?
Q78. What is the difference between JOIN and UNION in SQL?






Part 10: https://www.techpointfunda.com/2022/07/sql-interview-part-10.html


Q79. How can you get the 3rd highest salary in SQL?
Q80. How can you delete the duplicate records from a table? 
Q83. How can you create a table from another table without using CREATE command?
Q84. How can you clone the table with schema and data?
Q85. How can you insert data from a table into another table without any loop or cursor?
Q88. How can you get the last inserted record id in SQL?
Q89. How can you update the gender column of the table to 'M' if 1, 'F' if 2, and 'U' if NULL?






Part 11: https://www.techpointfunda.com/2022/08/sql-interview-part-11.html


Q90. What is the stored procedure? What are the features of a stored procedure?
Q91. While you creating stored procedures you have seen some SET Options like ANSI_NULLS, NOCOUNT, QUOTED IDENTIFIER, etc. What is the purpose of these SET Options in SP?
Q92. What do you understand by the fully qualified name (three-part identifiers) of the stored procedure? When the fully qualified SP name is required?
Q93. What are the advantages and disadvantages of using stored procedures?
Q94. How can you manage the stored procedure? Can you tell me some metadata objects which are used to view and manage the SP?
Q95. What are different types of stored procedures?
Q96. Why the "sp_ " prefix should be avoided while creating a user-defined Stored Procedure?
Q97. What is Parametrized Stored Procedure? What are the different ways to pass parameters in stored procedures? 
Q98. What is the OUTPUT parameter in the stored procedure? Can the OUT parameter be defined as Default as well? 
Q99. What is the Default Parameter in the stored procedure?







Part 12: https://www.techpointfunda.com/2022/08/sql-interview-part-12.html


Q100. How can you return value from a stored procedure?
Q101. What is a temporary stored procedure? What is the use of a temp stored procedure?
Q102. What is the difference between recursive vs nested stored procedures? 
Q103. What is the use of the WITH RECOMPILE option in the stored procedure? Why one should use it?
Q104. How can you ENCRYPT and DECRYPT the stored procedure? 
Q105. How can you improve the performance of a stored procedure?
Q106. What is SCHEMABINDING in stored procedure? If all the stored procedures are bounded to the schema by default, then why do we need to do it explicitly?
Q107. How can you write a stored procedure which executes automatically when SQL Server restarts?
Q108. Is stored procedure names case-sensitive?
Q109. What is CLR stored procedure? What is the use of the CLR procedure?
Q110. What is the use of  EXECUTE AS clause in the stored procedure?  







Part 13: https://www.techpointfunda.com/2022/08/sql-interview-part-13.html


Q111. What is SQL Function? What are the different types of functions in SQL?
Q112. What is the difference between Deterministic vs Non-Deterministic SQL Functions?
Q113. What are the different System SQL Functions?
Q114. What is User Defined Function (UDF) in SQL? What is the advantage of UDF in SQL?
Q115. What are the features and limitations of User-Defined SQL Functions (UDF)?
Q116. What are the different Scalar User-Defined SQL Functions?
Q117. What are the different Table-Valued UDF in SQL?
Q118. What is Schema Bound function in SQL? What is the advantage of schema-bound functions?
Q119. What is the difference between Stored Procedure and User-Defined Function in SQL?
Q120. What is the difference between Table-Valued Functions and View in SQL? 







Part 14: https://www.techpointfunda.com/2022/04/sql-interview-part-14.html


Q100. How can you return value from a stored procedure?
Q121. What is View in SQL? 
Q122. What are the Advantages and Disadvantages of view?
Q123. What are the different types of views in SQL?
Q124. What is Schema Bounded View? What are its advantages?
Q125. What is Indexed View or Materialized View in SQL?
Q126. What is a Partitioned View? What is its use in SQL?
Q127. Can you UPDATE or DELETE the records from View? What is the updatable view?
Q128. Can you add the Primary Key Constraint in the View? 
Q129. What is the difference between View and Table?
Q130. What is the difference between View and Temp Table?









Q131. What is a Trigger in SQL? 
Q132. What are the Advantages and Disadvantages of Triggers in SQL?
Q133. What are the different types of Triggers available in SQL?
Q134. What is DML Trigger in SQL? What is the application of DML Triggers?
Q135. What is AFTER or FOR TRIGGER in SQL? What is the use of AFTER DML Trigger?
Q136. What is INSTEAD OF TRIGGER in SQL? How can you use the INSTEAD OF Trigger to update the VIEW?
Q137. What is DDL TRIGGER in SQL? What is the application of  DDL Triggers?
Q138. What is LOGON TRIGGER in SQL? What is the application of  LOGON Triggers?
Q139. What is the difference between Recursive Trigger and Nested Trigger in SQL?
Q140. What are the MAGIC TABLES in SQL? What is the use of INSERTED and DELETED tables in SQL?







Part 16: https://www.techpointfunda.com/2022/09/sql-interview-part-16.html


Q141. What is the Cursor in SQL? 
Q142. What is the Cursor Life Cycle in SQL? 
Q143. What are the different types of Cursors in SQL? 
Q144. What is the Static Cursor or InSensitive Cursor in SQL? 
Q145. What is the Dynamic Cursor in SQL? 
Q146. What is the Forward Only Cursor or Firehouse Cursor in SQL? What is the difference between Forward-Only and Fast Forward Cursor?
Q147. What is the KeySet Cursor in SQL? 
Q148. What are the advantages and applications of Cursors in SQL?
Q149. What are the disadvantages or limitations of Cursors in SQL? 
Q150. What is the difference between Loop and Cursor?
Q151. How you can avoid the cursor in SQL? What are the different alternatives of Cursor in SQL?







Part 17: https://www.techpointfunda.com/2022/09/sql-interview-part-17.html


Q152. What is a Transaction in SQL?
Q153. What is TCL in SQL? What are the different TCL commands?
Q154. What are ACID properties in SQL?
Q155. What is the use of SAVEPOINT in Transaction?
Q156. What is the difference between COMMIT and SAVE transactions in SQL?
Q157.  What is the use of @@TRANCOUNT in SQL?
Q158. What is the difference between TRANSACTION and DISTRIBUTED TRANSACTION in SQL?
Q159. What is a Two-Phase Commit (2PC) in SQL?  Why it is required?
Q160. What is the SET XACT_ABORT  option in SQL? How does it affect the transaction?






Part 18: https://www.techpointfunda.com/2022/09/sql-interview-part-18.html


Q161. What is Concurrency in SQL? What are the different concurrency problems in SQL?
Q162. What is a Dirty Read Problem in SQL? How can you avoid this Dirty Read Problem?
Q163. What is a Phantom Read Problem in SQL? How can you avoid this Phantom Read Problem?
Q164. What is a Non-Repeatable Read Problem in SQL? How can you avoid this Non-Repeatable Read Problem of SQL?
Q165. What is a Lost Update Problem in SQL? How can you avoid this Lost Update Problem of SQL?
Q166. How can you solve the Concurrency Problems in SQL? What are the different Concurrency Control Mechanisms available in SQL? 
Q167. What is Transaction Isolation? What are the different Transaction Isolation Levels in SQL?
Q168. What is the difference between the Read Committed and Read Uncommitted Isolation Levels in SQL?
Q169. What is the Repeatable Read Isolation Level in SQL?
Q170. What is the difference between Serializable and Snapshot Isolation Levels in SQL?







Part 19: https://www.techpointfunda.com/2022/09/sql-interview-part-19.html


Q171. What is LOCK in SQL? Why locking is important in SQL if it causes performance overheads?
Q172. What is the Locking Hierarchy in SQL? What are the different resources that can have a lock?
Q173. What are the different types of lock modes in SQL?
Q174. What is Shared Lock (S) in SQL?
Q175. What is Exclusive Lock (X) in SQL?
Q176. What is Update Lock (U) in SQL?
Q177. What is Intent Lock (I) in SQL? What are the different types of Intent Lock?
Q178. What is Schema Lock (Sch) in SQL?
Q179. What is Bulk Update Lock (BU) in SQL?
Q180. What is the Key Range Lock in SQL?











Q181. What is SQL Lock Compatibility? Can a resource have multiple locks at the same time?
Q182. What is Lock Escalation in SQL?
Q183. What is Dynamic Locking in SQL?
Q184. What is SQL Table Hint? 
Q185. What is the difference between NOLOCK, and NOWAIT Table Hint in SQL?
Q186. What is the difference between READPAST and READUNCOMMITED Table Hint?
Q187. What is the difference between IGNORE_CONSTRAINTS and IGNORE_TRIGGERS table hint?
Q188. What is the use of INDEX Table Hint? What is the difference between INDEX(0) and INDEX(1) hint?
Q189. What is the difference between FORCESEEK vs FORCESCAN Table Hint?
Q190. How can you check the occupied locks on a table or database?








Q191. What is a deadlock in SQL? What is the difference between Deadlocking vs Blocking?
Q192. How can you detect and prevent deadlock in SQL?
Q193. What are the different tools that can be used to detect the deadlock? 
Q194. If there is a table that is causing a deadlock most frequently. How can you minimize the deadlock on that table?
Q195. What is Nested Transaction in SQL?
Q196. What is the use of the @@ROWCOUNT function in SQL?
Q197. What is Distributed Transaction in SQL?
Q198. Does Temp Table support TCL Commands?  Can you use a Temp Table in Transaction?
Q199. Does Table Variable support TCL Commands?  Can you use a Table Variable in Transaction?
Q200. Does Table-Valued Type support TCL Commands?  Can you use a Table-Valued Type in Transaction?










Q201. How can you Handle Exceptions in SQL? Can you use the TRY/CATCH in SQL?
Q202. What is the TRY-CATCH Exception Handling Mechanism in SQL?
Q203. What is the @@ERROR function in SQL?
Q204. What is ERROR_MESSAGE() function in SQL?
Q205. What is the use of the RAISERROR () function in SQL?
Q206. What is the use of the THROW Statement in SQL?
Q207. What is the difference between the RAISERROR function and the THROW statement?
Q208. What are the Predefined Errors and their formats in SQL?
Q209. How can you generate user-defined custom error messages in SQL? 
Q210. What is the Error Severity in SQL? What is its use?











Q211. What is Dynamic SQL Query(D-SQL) in SQL? How it is different from Static SQL Query?
Q212. How can you run the Dynamic SQL Query? What is the difference between EXECUTE(), and sp_executesql() in SQL?
Q213. Can you use Dynamic SQL Query in Functions? Why?
Q214. Can you use the OUT parameter in a Dynamic SQL Query? 
Q215. Can you return a value from the Dynamic SQL Query?
Q216. Can you use Temp Table in Dynamic SQL Query?
Q217. Can you use Transaction in Dynamic SQL Query?
Q218. What is the QUOTENAME() function in SQL?
Q219. What is SQL Injection? How can you prevent SQL Injection attacks?
Q220. Can you give me some Real Use Cases of Dynamic SQL Queries?










Q221. What is an IDENTITY in SQL?
Q222. What is the use of the @@IDENTITY function in SQL?
Q223. What is the use of the DBCC CHECKIDENT command?
Q224. What is Sequence in SQL?
Q225. What is the difference between an IDENTITY Column and a Sequence Object in SQL?
Q226. What is the use of the OUTPUT INTO clause in SQL?
Q227. What is a wildcard character in SQL? What is the use of the LIKE keyword in SQL?
Q228. What is SQL Data Type in SQL? How a scaler values type is different from a table-valued type?
Q229. How can you do Bulk Copy in SQL? What is the SQL BulkCopy? 
Q230. What are the different types of backup in SQL?













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Sunday, January 29, 2023

C# Interview Questions and Answers List

CSharp-Interview-Questions , csharp-interview-questions-list
C# Interview Questions and Answers List

C# Interview Questions and Answers List

csharp-interview-questions-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. 

Please visit our YouTube Channel for Interviews and other videos by below link:



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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