C# is a Microsoft-developed, general-purpose, object-oriented programming language that has been accepted by the ISO (International Standards Organization) and ECMA (European Computer Manufacturers Association).

During the development of the .Net Framework, Anders Hejlsberg and his colleagues created C#. C# is intended for the CLI (Common Language Infrastructure), consisting of a runtime environment and an executable code that enables the use of a variety of high-level languages on a variety of computer platforms and architectures.

C# programming features:

  • Windows Integration
  • A library that is standard
  • Automated Garbage Collection
  • Boolean Conditions
  • Lambda Expressions and LINQ
  • Proper Indexers
  • Generics that are easy-to-use
  • Assembly Versioning
  • Multithreading that is simple
  • Event Managers and Delegates
  • Properties and Events
  • Conditional Compilation

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Top 20 C# Interview Questions and Answers

Now, let us take a look at the top 20 C# interview questions that you might face!

1. Differentiate between Break and Continue Statement.

Continue statement - Used in jumping over a particular iteration and getting into the next iteration of the loop.

Break statement - Used to skip the next statements of the current iteration and come out of the loop. 

2. List the different types of comments in C#.

 The different types of comments in C# are:

  • XML comments 

Example -

/// example of XML comment

  • Single Line comments

Example -

// example of single-line comment

  • Multi-line comments

Example -

/* example of an 

multiline comment */

3. Explain the four steps involved in the C# code compilation.

Four steps of code compilation in C# include -

  • Source code compilation in managed code.
  • Newly created code is clubbed with assembly code.
  • The Common Language Runtime (CLR) is loaded.
  • Assembly execution is done through CLR.

4. Discuss the various methods to pass parameters in a method.

The various methods of passing parameters in a method include -

  • Output parameters: Lets the method return more than one value.
  • Value parameters: The formal value copies and stores the value of the actual argument, which enables the manipulation of the formal parameter without affecting the value of the actual parameter.
  • Reference parameters: The memory address of the actual parameter is stored in the formal argument, which means any change to the formal parameter would reflect on the actual argument too.

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5. Name all the C# access modifiers.

The C# access modifiers are -

  • Private Access Modifier - A private attribute or method is one that can only be accessed from within the class.
  • Public Access Modifier - When an attribute or method is declared public, it can be accessed from anywhere in the code.
  • Internal Access Modifier - When a property or method is defined as internal, it can only be accessible from the current assembly point of that class.
  • Protected Access Modifier - When a user declares a method or attribute as protected, it can only be accessed by members of that class and those who inherit it.

6. Mention all the advantages of C#.

The following are the advantages of C# -

  • C# is component-oriented.
  • It is an object-oriented language.
  • The syntax is really easy to grasp.
  • It is easier to learn.
  • C# is part of the framework called .NET

7. Mention the important IDEs for C# development provided by Microsoft.

The following IDEs’ are useful in C# development -

  • MonoDevelop
  • Visual Studio Code (VS Code)
  • Browxy
  • Visual Studio Express (VSE)
  • Visual Web Developer (VWD)

8. Why do we use C# language?

Below are the reasons why we use the C# language -

  • C# is a component-oriented language.
  • It is easy to pass parameters in the C# language.
  • The C# language can be compiled on many platforms.
  • The C# language follows a structured approach.
  • It is easy to learn and pick up.
  • The C# language produces really efficient and readable programmes.

9. Mention the features of C# briefly.

Some of the main features of C# are -

  • C# is a safely typed and managed language.
  • C# is object-oriented in nature.
  • C# is a Cross-platform friendly language.
  • C# is a platform-independent language when it comes to compilation.
  • C# is general purpose in nature.
  • C# is used in implementing Destructors and Constructors.
  • C# is part of the .NET framework.
  • C# is an easy-to-learn and easy-to-grasp language.
  • C# is a structured language.

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10. Mention all the differences between void, Public and Static keywords.

void - A method of a void type of value does not return anything.

Static - To declare a member of a specific type, we use the Static keyword.

Public - A member declared with the public keyword states that can be accessed by any other member of any other class publicly.

11. Define Class.

A class is an object's blueprint. It specifies the many types of data and functions that objects will have. A class allows you to combine variables of various events, types, and methods to construct your own custom types. A class in C# is defined via the class keyword.

12. What is meant by Unmanaged or Managed Code?

In simple terms, managed code is code that is executed by the CLR (Common Language Runtime). This means that every application code is totally dependent on the .NET platform and is regarded as overseen in light of it. Code executed by a runtime programme that is not part of the .NET platform is considered unmanaged code. Memory, security, and other activities related to execution will be handled by the application's runtime.

13. What is meant by an Abstract Class?

It's a type of class whose objects can't be instantiated, and it's signified by the term 'abstract'. It consists of a methodology or a single approach.

14. Differentiate between finalize blocks and finalize.

Once the try and catch blocks have been completed, the finalize block is called since it is used for exception handling. No matter if the exception has been captured, this block of code is run. In general, the code in this block is cleaner.

Just before garbage collection, the finalize method is called. The main priorities of the finalize method are to clean up unmanaged code, which is automatically triggered whenever an instance is not re-called.

15. Define an Object.

An object is a representation of a class that is used to access the class's methods. The "New" keyword is used to create an object, and a class that generates an object in memory has information about that class's methods, variables, and behavior.

16. What is a Sealed Class in C#?

To prevent a class from being inherited, we need to construct sealed classes. Sealable modifiers are used to do this. A compilation problem happens if we try to forcefully define a sealed class as a base class.

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17. What is meant by method overloading in C#?

Creating numerous named and unique signatures containing methods with the same class is known as method overloading. Overload resolution is used by the compiler to identify which method will be invoked when you compile.

18. What is meant by an Interface?

An interface is a class that does not have any implementation. Only the declarations of events, properties, and attributes are included.

19. What is meant by a Partial Class?

A partial class effectively breaks a class's definition into various classes in the same or other source code files. A class definition can be written in numerous files, but it is compiled as a single class at runtime, and when a class is formed, all methods from all source files can be accessed using the same object. The keyword 'partial' denotes this.

20. Differentiate between method overloading and method overriding?

Method overriding modifies derived class definition, which modifies the method behavior. Method overloading is the process of defining the same name method but with distinct signatures under the same class.

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