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7 C# Interview Questions and Answers

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What are some of the advantages of using C#? Which features do you find most useful? 


This question will be reasonably simple for a C# user with any amount of experience. It offers a baseline understanding of the candidate's experience with C#. What to look for:

  • Clear understanding of when and how C# is used
  • Ability to articulate several basic advantages of C#
  • Knowledge of several important features of C#

"One of the primary advantages of C# is that it is easy to learn. Other advantages include the fact that it is component oriented, object-oriented and part of .NET framework. Some of the features I find myself using most often are constructors and destructors, passing parameters, XML documentation and indexers."


What IDE have you used with C#? Do you have a preference? If so, why?


The most common IDE is Visual Studio, though there are other IDEs available. This question offers deeper insight into the candidate's experience with C#. What to look for:

  • Reference to the most common IDEs, Microsoft Visual Studio (VS) and Visual Studio Community
  • Awareness of other options available, such as SharpDevelop
  • Ability to list important features of the IDE

"I have tried using open-source IDEs like SharpDevelop, but I typically stick with Visual Studio. It has an excellent debugger, and it is frequently updated with new features."


Can you explain the three types of comments in C#? How are the comments represented?


Ensure that the candidate has basic technical knowledge by asking nuts-and-bolts questions related to writing code in C#. What to look for:

  • Single Line Comment (//)
  • Multiline Comment (/**/)
  • XML Comment (///)

"The three types of comments are Single Line Comments, two forward slashes, Multiline Comments, forward slash, star star, forward slash and XML Comments, three forward slashes."


Can you describe the difference between the "constant" and the "readonly" variables when using C#? When would you use each one?


This is another opportunity to ensure the candidate has basic technical knowledge of C# programming. What to look for:

  • Ability to articulate how each is defined
  • Clear explanation of when to use each one

"The constant/const keyword stays constant and cannot be modified later on. Assigning value is required with constant variables. On the other hand, the readonly keyword represents variability. Values can be assigned at the time of declaration or in the constructor."


Can you list the differences between static, public and void? What is the outcome of using each?


This is a more advanced technical question, adding to your insight into the candidate's experience and expertise with C#. What to look for:

  • Clear, concise explanation of static
  • Clear, concise explanation of public
  • Clear, concise explanation of void

"Classes, methods and variables that are static can be accessed in the application without creating instance. The method address is stored as an entry point. Methods or variables that are public can be accessed throughout the application. Void should be used for methods to specify that it won't return a value."


Can you list the value types in C#? Can you list the reference types in C#?


This is a technical question that measures foundational knowledge of C#. What to look for:

  • A complete list of the seven value types
  • A complete list of the four reference types

"The seven value types are decimal, byte, double, float, int, enum and long. The four reference types are class, interface, string and object."


Is there a difference between "String" and "StringBuilder" in C#? If so, what is the difference?


This question builds on previous questions to measure the depth of the candidate's knowledge. What to look for:

  • The candidate's understanding that there is a difference between the two
  • An ability to clearly and concisely articulate the difference

"String is absolute. The String object cannot be modified. Once an object for StringBuilder is created, it can still be changed using Replace, Append or Remove."

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