Most Commonly Asked C# Interview Questions and Answers
Introduction to C#
C# (aka C sharp) is an object-oriented programming language which is used widely by developers to carry out multiple tasks and accomplishes numerous goals. Basically, there are many types of object-oriented programming languages such as C++, Python, Java. And these programming languages are developed for a specific framework. Likewise, the C# is also designed and developed for a specific framework, i.e. .NET. The .NET framework is a brainchild of Microsoft. And it provides a massive platform to create applications, declarations, and commands for applications and so on.
When the C# language was introduced in the market, it was named as COOL which stood for C-like Object-Oriented Language. But Microsoft was unable to carry forward this name as there were some issues regarding trademark law. Then they decided to change its name from COOL to C#. At that time, Java became the thought leader of the programming industry. This provoked other companies to create their own best framework.
And this is the reason why Microsoft developed its own framework .NET and created a new OOP programming language to rival Java. And Microsoft diverted the market demands towards its C# language. The C# came out to perform faster and better than Java. And the developers across the globe popularly used to build applications meticulously.
The C# got global acceptance and appreciation for not only performing better, but it was easy to use too. It was easy enough to be used just by having some knowledge about codes. Further with practice, the users could develop muscle memory to use C#. The C# can be used for web development, games, mobile apps, applications for windows and other such programs. With such features, the usage of C# has surged, and demands for professionals who could use it precisely has increased two folds. In this article, we have organized and listed all the important interview questions that are asked most frequently. In here, we have categorized questions amongst three distinct levels:
- Beginner Level C# Interview Questions
- Intermediate Level C# Interview Questions
- Advanced Level C# Interview Questions
We have done so to help you learn about the C# interview questions easily in a systematic way.
Beginner Level C# Interview Questions
Q1. List some of the features with the definition of C#.
A programming language is used to write software for a website, a desktop application or a mobile application. All of these types of software is built using a programming language.
In C# we have .Net framework that has virtual machines like Common Language Runtime or CLR & Base class Libraries. Any application code is compiled and run into the windows; .Net framework comes into action by executing it. We use Visual studio .Net in the Microsoft word to write the codes.
This allows us what type of application we are going to build and what programming language we are going to use. There is plenty of programming language that the .Net support but C# is easy to learn, easy to work with and doesn’t sacrifice power and control.
C# is known as an object-oriented programming language that means we build and model our application by looking at its blueprint. These blueprints are classes that help us to model our application. Every time a user uses this application, then one part of these blueprint gets turned in to an actual object in memory to work with.
Q2. Mention the different types of comments in C#?
To be specific comments are the message you put on your code or you want to deactivate some lines of code and see how it works without them or describe what some of your code is trying to perform.
A comment line uses double slash followed by the comment. It breaks up the code and makes it look a little nicer if it is an advanced code than its wise to put in a couple of comment just to explain what is going on.
Example:
// These two lines change the colour of the text.
Comment Blocks must start with a “/” followed by an “*” & it must finish with an “*” and a “/”. You can have as many lines in between them as you like. And then you can add a Multi-line comment to describe things that are going on.
Example:
/* Comment line
*Comment block
*comment web report
************************/
*
Comment web report: You can do it before the static void main, or you can do it for the class program. You do three “///” & you will find XML to pop up where you write the summary about the void main in here.
Example;
/// This is comment web report, looks great!
Q3. What are some of the IDE’s provided by Microsoft for C# development?
IDE or integrated development environment is a piece of software that helps us to write codes. IDE makes developing applications program easier. It acts as a text editor, debugger, and compiler all in one. There are many different types of IDEs; some common IDEs are Visual Studio, Xcode, Android Studio, Pycharm, eclipse, sublime, Adam, to name a few.
Example:
> if (programmer)
> {
> use This = True
> }
Q4. Chart out the process of code compilation in C#.
We have the language independency when we are working with .Net framework, the complete compilation process for any particular language in .Net framework we can classify the compilation process into two parts. The first step involves compiling of the language by the compiler and then redirected to a intermediate language. While in the second phase the compilation is done by the JIT or Just-In-Time.
Q5. Differentiate between managed and unmanaged code?
The code that executes with the CLR instead of operating system is called as a Managed code. In the managed code the runtime will provide services like garbage collector, type checking & exception handling. The code is compiled by the language compiler into Intermediate language.
While a code that does not execute under CLR and is directly executes in the operating system is called as unmanaged code. It does not provide services like garbage collector & type checking, it should be taken care by the programmer itself. He should write the code to deal locate the memory. Here code will be compiled into native code.
Intermediate Level C# Interview Questions
Q1. Differentiate Finally Block and Finalize Block.
At the end of performing the try and catch blocks, the final block is declared. The finally block basically utilized to handle the exception. When some sort of exception is found in the block of code while performing the block, normally these block codes contain cleaner codes, to clean the exception.
When the exception is found, then the next should be garbage collection. At these types of circumstances, the Finalize method is called for the cleaning operation to run successfully.
Q2. What do you know about managed and unmanaged codes?
The managed code is that type of code which is performed or executed by Common Language Run-time. This indicates that the application codes hinge on the .NET platform. At the same time, the unmanaged code can be defined as the codes that are performed by a run-time application which doesn’t belong to the .NET framework. In those cases, the memory, security and execution of unmanaged codes totally depend on that different run-time application.
Q3. Define an Object in C#
The Object can be referred to as an instance of any class. In order to access the methods of a class, one has to make use of objects. To create or generate an object, the developers should use a separate and fresh keyword. The creation of an object takes place in the memory location of a class. The memory location of that class comprises of the required data of methods, behaviour and variables of the class.
Q4. Define class
In general, a class can be defined as an outline of an object. The class decides the basic functions and abilities that an object should possess. As the class is an object’s blueprint, an object can be called as an instance of the class. It is the class that helps the developers to produce an object. However, in C#, the class is basically termed as a keyword of class or class keyword.
Q5. What is an abstract class in C#?
An abstract class can be defined as a type of class which consists of a particular technique, and it is written with “Abstract” keyword. As the abstract class has a specific approach, an object cannot be instantiated from this class.
Q6. How will you define sealed classes in C#?
A sealed class is a type of class which is created in such a way that it cannot be inherited by C#. Unlike the abstract class, a sealed class can be instantiated, but it cannot be inherited. The main purpose of the sealed class is to limit the inheritance of class.
Q7. What do you mean by partial class in C#?
The partial class is a type of class that divides the definition of a single class into multiple classes. This segregation of single class definition can be carried out by means of the same source codes or various different source codes. It is possible to create one class definition in numerous files, but that is accumulated as a single class at the run-time application. And then an instance or object of that class is produced. And with the help of that object, the user can easily enter into all the methods of the class from various source files. The partial class is depicted by the keyword “Partial”.
Q8. What are the fundamental OOP concepts in C#?
One can list down four fundamental Object-Oriented Programs concept, and those are:
- Inheritance
When the characteristic feature is Continue Reading
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