Top 30 C# Interview Questions and Answers

Overriding Equals method helps to compare objects based on their values rather than their references.

• Default implementation of Equals method compares object references

• Overriding Equals method allows custom comparison based on object values

• Helps in im...read more

ViewData, ViewBag, and TempData are ways to pass data between controllers and views in ASP.NET MVC.

• ViewData is a dictionary object used to pass data from controller to view. It requires typecasting.

• ViewBag is a dynamic property used to pass data from...read more

I have completed 5 projects in C# including a web application, a desktop application, and a game.

• Developed a web application using ASP.NET MVC

• Created a desktop application for data management

• Designed a game using Unity and C# scripting

C# is a programming language while .NET is a framework that supports multiple languages including C#.

• C# is a programming language developed by Microsoft.

• .NET is a framework developed by Microsoft that supports multiple languages including C#.

• C# is us...read more

C# is a modern, object-oriented programming language developed by Microsoft.

• C# is used to develop Windows desktop applications, games, mobile apps, and web applications.

• It is strongly typed and supports both value and reference types.

• C# uses a syntax...read more

A C# program to demonstrate basic concepts like variables, loops, and conditionals.

• Use 'int' for integers: int number = 5;

• Implement loops: for (int i = 0; i < 5; i++) { Console.WriteLine(i); }

• Use conditionals: if (number > 0) { Console.WriteLine('Pos...read more

Yes, I have used indexer extensively in my previous projects.

• I have used indexer to access elements in arrays and lists.

• I have also used it to access properties and methods of objects.

• Indexer has helped me to write more concise and readable code.

• For ...read more

Yield keyword is used in C# to return a sequence of values one at a time.

• Yield keyword is used in iterator methods to return each element one by one.

• It allows the method to return multiple values without needing to store them all in memory.

• Yield retu...read more

Transient creates a new instance every time it is requested, Scoped creates a new instance per scope, Singleton creates a single instance for the entire application.

• Transient: Creates a new instance every time it is requested.

• AddScoped: Creates a new...read more

Lock keyword is used in C# to synchronize access to a shared resource by allowing only one thread to enter a critical section at a time.

• Used to prevent multiple threads from accessing a shared resource simultaneously

• Helps in avoiding race conditions ...read more

Basic C# concepts include data types, variables, loops, conditional statements, classes, and methods.

• Data types in C# include int, string, bool, double, etc.

• Variables are used to store data and can be declared using var keyword.

• Loops like for, while,...read more

Indexers in C# allow objects to be indexed like arrays, providing a way to access elements using an index value.

• Indexers are defined using 'this' keyword followed by square brackets containing the index parameters.

• They can be used to get or set the v...read more

Manageable codes in dot net are codes that are easy to understand, maintain, and debug.

• Well-structured and organized code

• Proper commenting and documentation

• Consistent naming conventions

• Modular design with reusable components

• Avoiding complex nested lo...read more

The difference between configure and configure services is that configure is a general term for setting up or adjusting something, while configure services specifically refers to setting up or adjusting services.

• Configure: General term for setting up...read more

const and readonly are keywords used in programming to define variables that cannot be modified.

• const is used to declare a constant variable that cannot be changed after initialization

• readonly is used to declare a variable that can only be assigned a...read more

C# is a programming language developed by Microsoft for building a wide range of applications on the .NET framework.

• C# is an object-oriented language with features like classes, inheritance, and polymorphism.

• It is strongly typed, meaning variables mu...read more

Namespace in C# is a way to organize and group related classes, interfaces, structs, enums, and delegates.

• Namespaces help in avoiding naming conflicts by providing a way to uniquely identify classes.

• They also help in organizing code and making it mor...read more

C# 10 introduces features like file-scoped namespaces, global using directives, and interpolated string handlers.

• File-scoped namespaces allow defining namespaces at the file level instead of wrapping everything in a namespace block.

• Global using direc...read more

Proficient in coding in C# with experience in developing various applications.

• Experienced in using C# for developing web applications, desktop applications, and APIs.

• Familiar with object-oriented programming concepts and design patterns in C#.

• Knowled...read more

The 'using' keyword in C# is used to define a scope in which an object is created and used, and automatically disposes of the object when the scope is exited.

• Used for managing resources like files, database connections, etc.

• Ensures that the object is...read more

I work on Visual C# 2019.

• I primarily work on Visual C# 2019 for my software development projects.

• I have experience with Visual C# 2017 and earlier versions as well.

• Visual C# 2019 offers new features and improvements over previous versions.

C# is a programming language developed by Microsoft for building a wide range of applications on the .NET framework.

• C# is widely used for developing desktop applications, web applications, mobile apps, games, and more.

• It is an object-oriented languag...read more

Constants are compile-time constants, while readonly variables can be assigned a value at runtime but cannot be changed after initialization.

• Constants are declared using the 'const' keyword, while readonly variables are declared using the 'readonly' ...read more

I was rated highly in C# language due to my strong understanding of object-oriented programming principles and experience with various C# frameworks.

• Strong understanding of object-oriented programming principles

• Experience with various C# frameworks s...read more

C# 10 introduces new features like file-scoped namespaces, global using directives, and interpolated string handlers.

• File-scoped namespaces allow defining namespaces at the file level instead of wrapping everything in a namespace block.

• Global using d...read more

Convert.ToString() is a static method that handles null values, while .ToString() is an instance method that may throw a NullReferenceException.

• Convert.ToString() is a static method that can handle null values and return an empty string if the input ...read more

var and dynamic are both used for type inference in C#, but var is statically typed while dynamic is dynamically typed.

• var is used to declare a variable with an inferred type at compile-time.

• dynamic is used to declare a variable with a type that is r...read more

ref and out are keywords in C# used for passing arguments to methods by reference.

• ref keyword is used to pass arguments by reference, allowing the method to modify the value of the argument

• out keyword is similar to ref, but the argument does not have...read more