50 Must Know C# Coding Interview Questions for Developers

Presenting today is 50 C# coding interview questions every developer should know. All questions contain a unique coding snippet.

Try to attempt each question carefully and test your C# programming skills. Solving these coding questions should be fun for you.

Click here to directly go to the C# programming test.

Also, we’ve listed down some quick C# coding tips which could be quite handy while programming.

So do read these tips to get the most out of this post.

C# Coding Test – 50 Questions.

Tips to write efficient code in C#.

  • Write header comments and place them at the top of files and functions to explain the objective, author, and change history. 
  • Use single line comments to define specific statements or code and indent them accordingly.
  • You can also use trailing comments on the same line as code and put a space or a tab to separate them.
  • While naming a class, use a noun or a noun phrase. Also, follow the Pascal case – write the first letter of the class name and each subsequent concatenated words in Capital case.
  • Don’t use keywords or reserved names while defining namespaces to avoid clashes.
  • Instead of using ToUpper(), call the Equals() method to do a comparison of a case sensitive string.
    • Note – ToUpper() will create a second temporary string object.
  • Create a String as a verbatim string. Any verbatim string starts with the @ symbol.
    • Note – The @ symbol notifies the string constructor to ignore escape characters and line breaks.

You can also read some more posts on C# and excel your programming skills.

50 Must Know C# Coding Interview Questions for Developers.

50 C# Coding Interview Questions for Developers

50 C# Coding Interview Questions.

Q-1. What will be the output of the following code snippet:

a) 6 12
b) 6 11
c) 7 12
d) 7 11

Check correct answer.
Option – a)

Q-2. What will be the output of the following code snippet:

a) 0
b) IndexOutOfRangeException
c) Nothing is printed as array is empty
d) 1

Check correct answer.
Option – b)

Q-3. What will be the output of the following code snippet:

a) Error
b) System.Byte
     System.Byte
c) System.Byte
     System.Int32
d) System.Int32
     System.Int32

Check correct answer.
Option – c)

Q-4. What will be the output of the following code snippet:

a) ok
b) i
     ok
c) PI undefined
     ok
d) Error

Check correct answer.
Option – b)

TOP

Q-5. What will be the output of the following code snippet:

a) 10
     10
b) 10
     100
c) 10
     1000
d) 100
     1000

Check correct answer.
Option – d)

Q-6. What will be the output of the following code snippet:

a) -1
b) 1
c) 0
d) Error

Check correct answer.
Option – a)

Q-7. What will be the output of the following code snippet:

a) 5
b) 10
c) 15
d) Error

Check correct answer.
Option – b)

Q-8. What will be the output of the following code snippet:

a) 2 3 8
     2 11 15 20
b) 2 3 8 11 15 20
c) 2 11 15 20
d) Error

Check correct answer.
Option – a)

Q-9. What will be the output of the following code snippet:

a) 65
     65
b) true
     false
c) 1
     0
d) Error

Check correct answer.
Option – a)

Q-10. What will be the output of the following code snippet:

a) 20,30
b) 0,20
c) 20,10
d) 10,50

Check correct answer.
Option – b)

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Q-11. What will be the output of the following code snippet:

a) char array: {123}
b) char array: [123]
c) char array: System.Char[]
d) char array: 123

Check correct answer.
Option – c)

Q-12. What will be the output of the following code snippet:

a) Hi, I am a Tech-savvy!!
b) Error
c) The program compiled successfully and nothing is printed
d) None of the above

Check correct answer.
Option – a)

Q-13. What will be the output of the following code snippet:

a) abc def ghi
b) ghi ghi ghi
c) abc abc abc
d) Error

Check correct answer.
Option – a)

Q-14. What will be the output of the following code snippet:

a) 0 1 2 3
b) 1 2 3 4
c) 4 4 4 4
d) Error

Check correct answer.
Option – c)

Q-15. What will be the output of the following code snippet:

a) Welcome,friends,to,TechBeamers
b) Welcome**friends**to**TechBeamers
c) Welcome*friends*to*TechBeamers
d) Welcome friends to TechBeamers

Check correct answer.
Option – b)

Q-16. What will be the output of the following code snippet:

a) Error
b) This number is an odd number
c) Square of this number is: 625
d) This number is an odd number
     Square of this number is: 625

Check correct answer.
Option – d)

Q-17. What will be the output of the following code snippet:

a) 20, 40, 35, 85, 70
b) 20, 40, 35, 85, 70, 60
c) 20, 35, 40, 60, 70, 85
d) 20, 35, 40, 60, 70

Check correct answer.
Option – c)

Q-18. What will be the output of the following code snippet:

a) True
b) False
c) Null
d) Error

Check correct answer.
Option – b)

Q-19. What will be the output of the following code snippet:

a) Learn CSharp
b) Let’s Learn
c) Let’s Learn CSharp
d) Null

Check correct answer.
Option – b)

Q-20. What will be the output of the following code snippet:

a) True
b) False
c) Null
d) Error

Check correct answer.
Option – a)

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Q-21. What will be the output of the following code snippet:

a) True
b) False
c) Null
d) Error

Check correct answer.
Option – a)

Q-22. What will be the output of the following code snippet:

a) ClassA
b) ClassB
c) ClassC
d) Error

Check correct answer.
Option – b)

Q-23. What will be the output of the following code snippet:

a) C A
b) C A B
c) B
d) NullReferenceException: C

Check correct answer.
Option – d)

Q-24. What will be the output of the following code snippet:

a) 2 1
b) 1 1
c) Compilation error (y is inaccessible due to its protection level)
d) program compiled successfully and nothing is printed

Check correct answer.
Option – c)

Q-25. What will be the output of the following code snippet:

a) A
    BC
    DEF
    GHIJ
    KLMNO
b) A
    AA
    AAA
    AAAA
    AAAAA
c) A
    AB
    ABC
    ABCD
    ABCDE
d) A
    AB
    BC
    BCD
    BCDE

Check correct answer.
Option – a)

TOP

Q-26. What will be the output of the following code snippet:

a) 8 4 16 12 20
b) 4 8 12 16 20
c) 2 4 6 8 10
d) 4 8 16 32 64

Check correct answer.
Option – b)

Q-27. What will be the output of the following code snippet:

a) 10
b) 9
c) Compilation Error: an object reference required to access non-static member
d) 100

Check correct answer.
Option – c)

Q-28. What will be the output of the following code snippet:

a) True True
b) True False
c) False True
d) False False

Check correct answer.
Option – a)

Q-29. What will be the output of the following code snippet:

a) Yes string contains Integer and it is 100
b) string does not contain Integer
c) Error
d) Null

Check correct answer.
Option – b)

Q-30. What will be the output of the following code snippet:

a) 1,13,3
b) 1,2,3
c) 11,12,13
d) 10,20,30

Check correct answer.
Option – a)

TOP

Q-31. What will be the output of the following code snippet:

a) 1 0
b) 1 1
c) 0 1
d) 0 0

Check correct answer.
Option – a)

Q-32. What will be the output of the following code snippet:

a) 4,11
b) 1,11
c) 4,7
d) 1,7

Check correct answer.
Option – b)

Q-33. What will be the output of the following code snippet:

a) 6 4
b) Compilation error: usage of unassigned out parameter
c) 3 2
d) Compilation Error: function call without creating an object

Check correct answer.
Option – b)

Q-34. What will be the output of the following code snippet:

a) Static Constructor
b) Program compiles successfully and nothing is printed
c) Default Constructor
     Static Constructor
d) Default Constructor

Check correct answer.
Option – c)

Q-35. What will be the output of the following code snippet:

a) TechBeamers Welcomes Its Readers
     To the World of C# !!
b) TechBeamers Welcomes Its Readers
c) Error: unexpected system exit
d) Program compiles successfully and nothing is printed

Check correct answer.
Option – b)

TOP

Q-36. What will be the output of the following code snippet:

a) CountIsZeroException: Zero count in DoAverage
b) Compilation error :exception not handled properly
c) CountIsZeroException : CountIsZeroException: Zero count in DoAverage
d) Program executed successfully

Check correct answer.
Option – c)

Q-37. What will be the output of the following code snippet:

a) Derived.Func(object)
b) Derived.Func(int)
c) Derived.Func(int)
     Base.Func(int)
d) Base.Func(int)

Check correct answer.
Option – a)

Q-38. What will be the output of the following code snippet:

a) Both Strings are Equal
     Both Strings are Unequal
b) Both Strings are Equal
     Both Strings are Equal
c) Both Strings are Unequal
     Both Strings are Unequal
d) Both Strings are Unequal
     Both Strings are Equal

Check correct answer.
Option – c)

Q-39. What will be the output of the following code snippet:

a) Class Executed
     Interface Executed
b) Class Executed
c) Interface Executed
d) Error

Check correct answer.
Option – a)

Q-40. What will be the output of the following code snippet:

a) 0
b) 1
c) Error: wrong use as statement
d) Nothing gets printed.

Check correct answer.
Option – c)

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Q-41. What will be the output of the following code snippet:

a) Error
b) -2
c) 2
d) 0

Check correct answer.
Option – c)

Q-42. What will be the output of the following code snippet:

a) execution failure
b) execution success
c) Error
d) Null

Check correct answer.
Option – b)

Q-43. What will be the output of the following code snippet:

a) 9
     9
b) 10
     10
c) 2
     1
d) 1
     0

Check correct answer.
Option – c)

Q-44. What will be the output of the following code snippet:

a) 4
     4
     2
b) 4
     2
     2
c) 4
     4
     4
d) 4
     2
     4

Check correct answer.
Option – a)

Q-45. What will be the output of the following code snippet:

a) Runtime Error
b) Compile time Error
c) Division By Zero
d) Infinity

Check correct answer.
Option – d)

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Q-46. What will be the output of the following code snippet:

a) 0 1 2 3 4 5 6 7 8 9
b) 0
     1
     2
     3
     4
     5
     6
     7
     8
     9
c) 32333435363738394041
d) Compile time Error

Check correct answer.
Option – c)

Q-47. What will be the output of the following code snippet:

a) True
b) False
c) Null
d) Error

Check correct answer.
Option – b)

Q-48. What will be the output of the following code snippet:

a) Object argument
b) double array argument
c) Object argument
     double array argument
d) The Program compiles successfully but nothing gets printed.

Check correct answer.
Option – b)

Q-49. What will be the output of the following code snippet:

a) HI
     hi
b) 145
     209
c) HI
     209
d) 145
     hi

Check correct answer.
Option – c)

Q-50. What will be the output of the following code snippet:

a) 12345
b) 135
c) 1345
d) Nothing gets printed

Check correct answer.
Option – b)

TOP

Summary – 50 C# Coding Interview Questions.

If the 50 C# coding interview questions aren’t enough for you, then do look up for more C# questions on our blog. We’ve plenty of other questions on loops, strings, classes and OOPs concepts.

Next, if you wish to share any feedback or like us to write on a topic of your interest, then do use the comment box to let us know.

Hope, our posts would keep helping you in transforming into a great programmer. Please don’t forget to like or follow on facebook or twitter.

Keep Learning,

TechBeamers.

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