C# Interview Questions and Answers
C#, sometimes also called as C sharp, is a component-oriented, general-purpose computer programming language that encompasses strong typing, declarative, imperative, and object-oriented disciplines. This information has been asked quite a few times recently in C# interview questions. It is a multi-paradigm language that was initially designed for Common Language Infrastructure (CLI).
C# allows the developers to build reusable components for a huge variety of applications. C# is an evolution or extension of C and C++ languages. However, it has taken much of its features from other programming languages as well, including Delphi and Java. When you analyze the basic syntax of C# and Java and C++, it will look very similar, which is intentional and not a coincidence.
Most Frequently Asked C# Interview Questions
| S.no | Constant variables | Read-only variables |
|---|---|---|
| 1. | Declared at compile time | Used to assign a value at run time |
| 2. | Value cannot be changed | Value can be changed |
| S.no | finally | finalize |
|---|---|---|
| 1. | Called after execution of block | Called before garbage collection |
| 2. | Used for exception handling. | Used for performing clean up operations |
| 3. | Usually contains clean-up code | Automatically called when an instance is not called subsequently. |
Programming errors in C# are mainly of three types - Syntax Errors, Run time Errors, and Logic Errors.
This information can be asked during C# interview questions and answers.
| S.no | Public | Static | Void |
|---|---|---|---|
| 1. | An access modifier | A type modifier | |
| 2. | Declared variables are accessible from anywhere | Declared variables are globally accessible | Variable does not return value |
A jagged array, also called an Array of arrays, contains different elements of a type array. The elements in a jagged array can be of different dimensions and sizes.
Value types in C# are stored in a Stack. For example, int, byte, double.
Reference types in C# are stored on a heap. For example, string, interface.
A constructor in C# is a member function of a class that contains the same name as its parent class. This function gets automatically invoked when an object class gets created. A constructor constructs values in data members while initializing the parent class.
There are five types of constructors - Static constructor, Private constructor, Copy constructor, Default constructor, and Parameterized constructor.
The access modifiers usually used in C# include Public, Private, Protected, Internal and Protected internal.
This is one of the frequently asked C# interview questions.
| S.no | Struct | Classes |
|---|---|---|
| 1. | Value-type | Reference types |
| 2. | Inheritance not supported | Inheritance supported |
| 3. | Members public by default | Members private by default |
This class is used for creating classes or objects that do not contain a specific data type. This kind of data type is assigned during the runtime.
Advantages
- Easy to understand
- Object and component-oriented
- Faster and safer
C# has grown very rapidly and is used widely. It is mostly because of its versatile syntax and cross-platform support. Developers who are trained in Java, C+ or C++ will be easily and quickly able to work in C#. We have updated our C# interview questions for freshers. The lambda expressions, nullable value types, direct memory access, delegates, and enumerations are powerful features that simplify the language C++; and on top of it, these add-ons are not available in other languages, such as Java.
Latest Version
Read more about recent versions if you are preparing for C# interview questions. The latest version, C# 7.3, was released in 2018.
Development History
C# was developed by Microsoft around the year 2000 within the .NET initiative. Later, this language got approved by Ecma (ECMA-334) as a standard. Designed by Anders Hejlsberg, the current development of C# is being taken care of by Mads Torgersen.