C# Interview Questions

 C# Interview Questions and Answers for Experience & Freshers (2022 Update)

C# is a general-purpose programming language that incorporates a wide range of programming paradigms and techniques, including object-oriented programming, static typing, component-oriented programming, strong typing, and many others. When it comes to the creation of websites, web apps, and games, the ASP.NET framework makes extensive use of C#. Opportunities to work with C# programming are plentiful in every region of the world. If you are considering a career in C# programming, you will need to pass an interview in which you will be asked various C# interview questions and answers ranging from the most basic to the most difficult. These questions and answers are provided below.
This is a selected list of the top C# interview questions and answers, which are the types of questions that are most likely to be asked during the interview. Interviewers are likely to ask candidates anything from fundamental C# questions to more sophisticated C# questions, based on the candidates’ level of experience as well as a variety of other criteria. This list contains all of the C sharp interview questions for beginners as well as all of the C# interview questions for experts with years of expertise.
C# Interview Questions and Answers for Beginners and Those with Two, Three, Five, or Ten Years of Experience
The following are some of the most common interview questions for applicants who are seasoned C# developers as well as those who are just starting out in the field.

C# Interview Questions and Answers for Freshers and 2/3/5/10 Years Experience

We have covered more than fifty often requested C# interview questions and answers, ranging from the most fundamental to the most advanced.
Basic Interview Questions for Those Who Are Just Starting Out in C#
What does “C#” stand for?
Explain the different types of comments available in C# with some examples.
Is it possible to execute multiple catch blocks at once?
What are the key distinctions between the public, static, and void access levels?
What exactly is a thing?
Explain what constructors are.
What exactly are these Jagged Arrays?
What is the distinction between the ref parameters and the out parameters?
The ‘using’ statement in C# serves what purpose exactly?
What exactly does “serialisation” mean?
1. What exactly is this C# thing?
The.Net framework compiles C#, which results in the generation of Microsoft Intermediate Language. C# is a managed language that is object-oriented, type-safe, and managed.

2. Use several examples to walk through the different forms of comments in C#.
Single line

Example:

/This is a comment on a single line ii. Multiple line comments (/* */):

Example:

/*This is a comment that spans many lines.
We are currently on line 2, which is the very last line of the comment for iii. XML Comments.

Eg:

3. Is it possible to execute multiple catch blocks at the same time? / summary; / Set error message for multilingual language. / summary 3.
No, you cannot execute several catch blocks of the same kind at the same time. The control then moves to the finally block once the appropriate catch code has completed executing, and once inside the finally block, the code that comes after it is the one that is carried out.

4. What is the distinction between the public, static, and void access levels?
Any variable or method that is declared as public can be accessed from anywhere inside the programme. Declared variables or methods that are static have access to the entire world even if an instance of the class has not been created. It is dependent on the type of access modification that was utilised whether or not static members are accessible worldwide by default. The entry point is determined by the address that is stored for the method, and the compiler uses this information to start the execution process before any objects are generated. In addition, the value of the Void type modifier indicates that the method or variable in question does not return any value.
5. Can you describe an object for me?
Object in C#
Object in C#

Through the use of an object, which is an instance of a class, we may access the methods that are associated with that class. When creating an object, the “New” keyword is what’s utilised. A class that generates an object in memory will have information stored within it pertaining to the methods, variables, and behaviours of the class that it generates.

6. Give an explanation of constructors
A member function in a class that is given the same name as the class it belongs to is referred to as a function Object() { [native code] }. Whenever an object class is created, the function Object() { [native code] } is immediately called upon to do its work. During the process of initialising the class, it builds the values of the data members.

7. Can you explain what a Jagged Array is?
Jagged Array is the name given to an Array that has items of the type array. The components can come in a variety of shapes, sizes, and measurements. A jagged array is sometimes known as an array of arrays, which is another name for it.

8. Can you explain the difference between ref parameters and out parameters?
While an argument that is being supplied to a method as a ref parameter needs to be initialised first, an argument that is being passed as an out parameter does not need to be initialised before.

9. Can you explain what the ‘using’ statement in C# is for?
The ‘using’ block is used to acquire a resource, put it through some processing, and then have it automatically disposed away once the execution of the block has been completed.

10. Can you explain what serialisation is?
If we wish to send something across a network, we have to first turn the thing we want to send into a stream of bytes. Serialization is the process of transforming an object into a stream of bytes. This process can take place in a variety of programming languages. It is necessary for an object to implement the ISerialize Interface for it to be possible to serialise the object. De-serialization is the process of producing an object from a stream of bytes in the opposite direction, hence the name.

11. Is it possible to utilise the “this” command when working within a static method?
Because static methods can only make use of static variables and methods, we are unable to use the ‘This’ keyword within a static method.

12. What is the key distinction between read-only and constants?
At the moment of compilation, constant variables are both defined and initialised. After it has been set, the value cannot be altered in any way. Only when we want to assign the value at run time do we employ the read-only access mode.
Advanced Interview Questions for C# for Candidates with 3, 5, or 10 Years of Experience
13. Can you explain what an interface class is? Please provide an illustration of it.
An abstract class is known as an interface, and an interface only has public abstract methods. The methods themselves only have the declaration, not the definition. The inherited classes are required to have these abstract methods implemented in their code.

using System; using System.

Collections.Generic; you’re using the System library.

Linq; utilising System.

Text; application of System.

Threading.Tasks; namespace DemoApplication; interface Guru99Interface; void SetTutorial(int pID, string pName); String GetTutorial(); Threading.Tasks; interface Guru99Interface; void SetTutorial(int pID, string pName); String GetTutorial()

class Guru99Tutorial consists of the following members: Guru99Interface, protected int TutorialID, protected string TutorialName, and protected boolean Result.

public void SetTutorial (int pID, string pName)
{ TutorialID = pID; TutorialName = pName; }

public String GetTutorial() { return TutorialName; }

static void Main(string[] args) { Guru99Tutorial pTutor = new Guru99Tutorial();

pTutor.SetTutorial(1,”,Net by Guru99″);

Console.WriteLine(pTutor.GetTutorial());

Console.ReadKey(); ; ; ; ; ; ; ; ; ; ; ; ; ;
14. Can you explain the difference between value types and reference types?
A value type has its own dedicated memory area in which it stores a data value. Example

a value of 30 is saved in the int variable a, while the Reference data type records the address of the Object that is housing the value. It acts as a pointer to a different location in memory.

string b = “Hello Guru99!!”; 15. What exactly is the difference between User Control and Custom Control?
Controls that are generated as compiled code (Dlls) are known as custom controls. These controls are simpler to use and can be added to a toolbox. The addition of controls to web forms is as simple as dragging and dropping for developers. At the time of design, attributes are able to. It is simple for us to integrate bespoke controls into several applications (If Shared Dlls). If they are not public, then we can copy them to a dll file, place it in the bin directory of the web application, add a reference to it, and then use the files.

User Controls are relatively straightforward to make, and they function in a manner that is quite comparable to that of ASP include files. It is not possible to put user controls in the toolbox and then drag and drop them from that location. They are backed by their own design and source code. Ascx is the file extension that is used for user controls.