Presenting today is 50 C# coding interview questions every developer should know. All questions contain a unique coding snippet.
So, try to solve each question carefully and test your C# programming skills. We’ve also listed down some quick C# coding tips which could be helpful.
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 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.
1. Check out 15 C# Questions – For, While Loops and If Else Statements.
2. C# Programming Test with 15 Questions on Classes.
50 Must Know 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)
TOP
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)
TOP
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)
TOP
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)
TOP
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.
Keep Learning,
TechBeamers.
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