Interview questions for C# developers

01

What is the difference between continue and break statements in C#?

02

What is C#?

03

What are Property Accessors?

04

What is an Object ?

05

What is an Abstract Class?

06

In how many ways you can pass parameters to a method?

07

What is Boxing and Unboxing?

08

What is LINQ in C#?

09

Can multiple catch blocks be executed?

10

What is Managed or Unmanaged Code?

11

What are generics in C#?

12

What is enum in C#?

13

What are partial classes?

14

What is the difference between a class and a structure ?

15

What you understand by Value types and Reference types in .NET? Provide some comparison

16

What are Nullable types in C#?

17

What is the difference between a Struct and a Class in C#?

18

Why to use finally block in C#?

19

What is Serialization?

20

What are dynamic type variables in C#?

21

What is the difference between string and StringBuilder in C#?

22

What are Reference Types in C#?

23

Can this be used within a Static method?

24

What are the different types of classes in C#?

25

What is namespace in C#?

26

How is Exception Handling implemented in C#?

27

What is sealed Class in C#?

28

What is the difference between ref and out keywords?

29

Is there a difference between throw and throw ex ?

30

How encapsulation is implemented in C#?

31

What is the difference between overloading and overriding?

32

What is Record in C#?

33

What is lambda expressions in C#?

34

Why can't you specify the accessibility modifier for methods inside the Interface?

35

What are the uses of using in C#

36

What is scope of a Internal member variable of a C# class?

37

Is there a way to catch multiple exceptions at once and without code duplication?

38

When to use Record vs Class vs Struct in C#?

39

What is the difference between Virtual method and Abstract method?

40

What is the difference between Interface and Abstract Class?

41

What is the difference between Equality Operator ( == ) and Equals() Method in C#?

42

How can you prevent a class from overriding in C#?

43

What is Extension Method in C# and how to use them?

44

Explain Code Compilation in C#

45

What is Reflection in C#.Net?

46

What is an anonymous function in C#?

47

What is difference between constant and readonly ?

48

What is Virtual Method in C#?

49

Explain Anonymous type in C#

50

What is the difference between dynamic type variables and object type variables?

51

What is a Destructor in C# and when shall I create one?

52

What is the use of the IDisposable interface?

53

Explain assignment vs shallow copy vs deep copy for a Record in C#

54

What is the use of Null Coalescing Operator ( ?? ) in C#?

55

Explain the difference between Task and Thread in .NET

56

What is difference between late binding and early binding in C#?

57

Is operator overloading supported in C#?

58

Can you create a function in C# which can accept varying number of arguments?

59

What's the difference between StackOverflowError and OutOfMemoryError ?

60

What is Indexer in C#?

61

What interface should your data structure implement to make the Where method work?

62

What are pointer types in C#?

63

What is the difference between System.ApplicationException class and System.SystemException class?

64

What is the difference between Func<string,string> and delegate ?

65

What is a static constructor?

66

Can you explain the difference between Interface , abstract class, sealed class, static class and
partial class in C#?

67

What is the Constructor Chaining in C#?

68

What is the yield keyword used for in C#?

69

How to solve Circular Reference?

70

When would you use delegates in C#?

71

What is the use of conditional preprocessor directive in C#?

72

Explain what is Short-Circuit Evaluation in C#

73

Explain the difference between Select and Where

74

What is the difference between is and as operators in C#?

75

What is Marshalling and why do we need it?

76

What is the best practice to have best performance using Lazy objects?

77

IEnumerable vs List - What to Use? How do they work?

78

Can Multiple Inheritance implemented in C# ?

79

What happens when we Box or Unbox Nullable types?

80

What is the difference between dispose and finalize methods in C#?

81

What are the different ways a method can be overloaded?

82

Why to use lock statement in C#?

83

When to use ArrayList over array[] in C#?

84

What is scope of a Protected Internal member variable of a C# class?

85

Could you explain the difference between destructor , dispose and finalize method?

86

Could you explain the difference between Func vs. Action vs. Predicate ?

87

Why Abstract class can not be sealed or static?

88

in C#, when should we use abstract classes instead of interfaces with extension methods?

89

Explain what is Weak Reference in C#?

90

You have defined a destructor in a class that you have developed by using the C#, but the destructor
never executed. Why?

91

What is the volatile keyword used for?

92

Can you add extension methods to an existing static class?

93

What are Circular References in C#?

94

What is the use of static constructors?

95

What are the differences between IEnumerable and IQueryable ?

96

Why doesn't C# allow static methods to implement an interface?

97

What's the difference between the System.Array.CopyTo() and System.Array.Clone() ?

98

Explain the difference between IQueryable , ICollection , IList & IDictionary interfaces?

99

Implement the Where method in C#. Explain

100

What is Multicast Delegate in C#?

101

List some different ways for equality check in .NET

102

What is the difference between Lambdas and Delegates?

103

What is a preprocessor directives in C#?

104

What is jagged array in C# and when to prefer jagged arrays over multi-dimensional arrays?

105

What is the method MemberwiseClone() doing?

106

What are the benefits of a Deferred Execution in LINQ?

107

Explain when to use Finalize vs Dispose ?

108

What is deep or shallow copy concept in C#?

Thách thức mọi câu hỏi phỏng vấn C# dành cho lập trình viên

Top 108 câu hỏi phỏng vấn C#