A List of the Best 21 C# Interview Questions and Their Solutions for the Year 2023

Preparing for an interview relating to C#? It is crucial to anticipate the kinds of questions you may face. Generally, these may involve core concepts of the language like data types, object-oriented programming and debugging practices. For the more advanced interview processes, you may be expected to answer queries relating to exception handling, memory management, and design patterns. To prepare for your C# interview, it’s important to have a firm grasp of the syntax and basic concepts. It is also helpful to practice answering frequently asked C#-related questions, and stay informed about recent developments in the field. Seeking out local user groups, actively joining online developer communities, and attending conferences and events related to the field can all be highly beneficial sources of networking and connection with other experienced professionals and .NET developers.

When it comes to C# interviews, technical and problem-solving questions are frequently asked. To help recruiters and potential candidates prepare themselves thoroughly, we have compiled a list of sample questions and answers that can be used prior to the interview.

“Shall we?” I said.

Thanks to its ability to support multiple programming paradigms and its general-purpose functionality, C# is ideal for a wide variety of projects. It affords developers the capability to create programs that are static, strong, lexically scoped, imperative, functional, declarative, generic, object-oriented and component-oriented. C# is one of the most widely used languages for operating system development, and as a result, there is a high demand for skilled C# developers in the software testing industry.

The top answers to the 21 most frequently asked C# interview questions

  1. What are the four steps involved in C# compilation?

    There are four stages to C# code compilation:
    • The compiler for “Managed code” source code.
    • Newly written code is merged with assembly code.
    • The Common Language Runtime (CLR) is initialized.
    • Assemblies are executed with the help of CLR.
  2. How can a method handle various types of parameters?

    There are several ways in which a method can handle its arguments.
    • Criteria for Success

      The method should have the ability to return multiple values.
    • Value Specifications:

      The formal parameter stores a replica of the actual argument value, which allows the latter to be edited without affecting the former.
    • Standard Values:

      The formal parameter saves the memory location of the actual argument, so any modifications made to the formal parameter are replicated in the actual parameter, resulting in the same outcome.
  3. Explain the difference between Managed and Unmanaged code.

    Managed code requires the Common Language Runtime (CLR) to execute and is referred to as “Managed” since the .NET framework uses the garbage collector internally to free up memory that is no longer required.

    On the other hand, “Unmanaged code” is processed by a framework other than .NET Framework or the .NET runtime.
  4. C# Class vs. Object: What’s the Distinction?

    A ‘Class’ is an abstract representation of a real-world entity, consisting of a set of related functions and data used to depict the actual object. This set of related operations is modelled to provide a convenient method of interacting with it.

    An object is a segment of memory utilized to hold other things such as variables, arrays and collections, as defined in computer science.
  5. Where can the distinct stages of the compilation process be found in C#?

    The compilation process in C# is divided into four stages:
    • The C# compiler transforms “Source code” into “Managed code”.
    • The assembly is executed using CLR.
    • Creating assemblies of newly-written code.
    • Loading CLR.
  6. Compare and contrast the Virtual and Abstract methods.

    Virtual methods necessitate a default implementation, whereas Abstract methods are not accompanied by any implementation.
  7. What is meant by an Escape Sequence? Can you list the names of the C# Escape Sequences?

    An Escape Sequence is represented by the backslash character (\), followed by another backslash character which represents a special character. This can be accomplished using a single character.
  8. Definition of “Serialisation”.

    Serialisation is the process of converting code into its binary form, allowing it to be conveniently saved and stored on a disk. It can be used to store and retrieve the original source code when necessary.
  9. Differentiating between Break and Continue statements.

    The differences between a Break statement and a Continue statement are as follows:
    • Continuing with the statement:

      It is used to skip a single iteration of the loop and proceed with the next one.
    • Mid-sentence:

      To exit a loop and prevent the execution of subsequent statements in the current iteration, use this.
  10. What is the distinction between the Finalize and Finalize blocks?

    After all exceptions have been handled inside the try and catch blocks, the Finalize block will be executed, regardless of whether or not an exception was caught.

    Before garbage collection occurs, the Finalize method is executed. If an object hasn’t been explicitly removed, the Finalize function is automatically invoked to clean up any unmanaged code.
  11. Definition of a Partial Class.

    The Partial keyword in C# allows developers to split a single class file into several distinct files. This feature is especially useful for breaking down large class files into multiple smaller physical files, making them easier to manage.
  12. What is the distinction between Method Overriding and Method Overloading?

    Overriding a method requires modifying the definition of the inherited class, which changes the behavior of the method.

    Method overloading entails creating many versions of a method with the same name but different signatures inside the same class.
  13. Introduction to Constructors and their Different Forms.

    Every class must have a constructor function when it is created. If a constructor has not already been defined, the compiler will automatically generate a default constructor and store it in the system memory. This function will configure the object using predetermined settings. Constructors come in various forms, including Public, Private, Static, and Copy.
  14. Definition of “Destructor” in C#.

    The garbage collector frees up memory and other system resources by automatically managing the destruction of objects, using the System.GC.collect() method. An alternative approach to freeing up resources is to use a destructor to explicitly free memory.
  15. What is the typical response when asking about Object-Oriented Programming?

    Through its inheritance feature, Object-Oriented Programming (OOP) allows for a powerful and convenient way to organise and maintain code. This feature allows programmers to create a base class that contains data and behaviour, and then use it to construct derived classes that either share or modify the parent class’s characteristics. These features enable developers to take advantage of code reusability, which reduces the amount of coding and debugging time, as well as creating a more organised and maintainable codebase.
  16. How to use a single class to implement multiple interfaces that have the same method name?

    It is not recommended to perform this task, as developers will likely face opposition when attempting to make such a change. Instead of having the same method name across several interfaces, a qualified professional should suggest specifying the interface name within the method body. This way, the compiler can detect which interfaces are being used and resolve the issue.
  17. Defining a “sealed” class.

    Developers utilize the “sealed” keyword to prevent future inheritance of a class, either when it’s unnecessary, or when it shouldn’t be inherited. This can be achieved by creating a sealed class. The “sealed” keyword can be used with both classes and methods. It instructs the compiler to prohibit further inheritance of the class, making it impossible to derive from it.
  18. Definition of Enumeration:

    An Enumeration is a unique data type that enables developers to create collections of related constants in programming. These collections can include integers, floating-point numbers, doubles, and bytes. Enumerations are useful data structures for storing and referencing a set of related values that are frequently used in code.

    Enumerations in the .NET framework generate constant numerical values rapidly for implementation in code. By default, each enumerator element’s value is an integer, and each subsequent enumerator in an array is increased by one from the preceding one’s value, beginning at zero for the initial enumerator.

    Here is a syntax example: enum Days { Mon, Tue, Wed, Thu, Fri, Sat, Sun };
  19. Definition of Serialisation for those not familiar.

    Before transmitting over a network, developers must convert objects into a stream of bytes. This is referred to as serialisation – the conversion of an object into a sequence of bits.
  20. Explaining the functioning of Multithreading.

    In C#, a thread is an autonomous process that executes a program’s instructions. While a single thread can accomplish tasks that require minimal processing, numerous threads of execution are typically required for modern applications. Multithreading enables concurrent execution of various sections of the program, resulting in increased efficiency and performance.

    Multithreading is a potent technique in software development that breaks down the execution of a process into multiple threads, each of which can be executed in parallel to boost efficiency. Furthermore, programmers can perform several tasks simultaneously.
  21. Explaining C# Generics.

    Generics in C# have the following four behaviours:
    • Enhancing efficiency.
    • The safety of the type needs to be enhanced.
    • We must reduce the duplication of code.
    • Develop a library of code.


This compilation of twenty-one questions offers an introduction to the basics of the C# programming language. They are useful for getting ready for interviews or conducting them. By asking these questions, one can ensure a thorough understanding of C# and its corresponding subjects.

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  • Firstly, let’s give a definition of C# NET programming.

    C# (pronounced “See Sharp”) is a contemporary, type-safe, and object-oriented programming language. Developers can use C# to create powerful and secure .NET applications. C# is a member of the C family of languages.
  • What type of questions should I expect during an advanced level C# interview?

    Here are the most crucial questions to ask during a C# interview.
    • The .NET Framework
    • CLR
    • CLS
    • CTS
    • Collections of Objects
    • Concepts of Object-Oriented Programming (Encapsulation, Inheritance, Polymorphism, Abstraction)
    • Difference Between Abstract and Interface
  • What is the best way to prepare for a C# interview?

    Over the past few years, the use of C# programming language has experienced a significant surge, and its corresponding ecosystem is thriving. C# can be used to build various products, such as websites, applications, games, and mobile applications, among others.

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