Skip to content

Desi banjara

learn and grow together

  • Azure
    • Azure Compute
      • Azure Logic Apps
      • Azure Mobile Apps
      • Azure App Service
      • Azure Serverless Computing
        • Azure Functions
    • Azure Networking services
      • Azure Networking – VNET
    • Azure Database Services
      • Azure SQL
      • Azure Data Factory
      • Azure Databricks
    • Azure Analytics Services
    • Azure Cognitive Services
    • Azure Data and Storage
    • Azure Devops
    • Azure landing zone
    • Azure IaaS
    • Azure Internet of Things (IoT)
      • Azure Machine Learning
      • Azure AI and ML services
    • Azure Migration
  • Agile Software development
    • Atlassian Jira
  • Amazon Web Services (AWS)
    • Amazon EC2
    • Amazon ECS
    • AWS Lambda
  • Google
    • Google Cloud Platform (GCP)
    • gmail api
    • Google Ads
    • Google AdSense
    • Google Analytics
    • Google Docs
    • Google Drive
    • Google Maps
    • Google search console
  • Software architecture
    • Service-oriented architecture (SOA)
    • Domain-Driven Design (DDD)
    • Microservices
    • Event-Driven Architecture
    • Command Query Responsibility Segregation (CQRS) Pattern
    • Layered Pattern
    • Model-View-Controller (MVC) Pattern
    • Hexagonal Architecture Pattern
    • Peer-to-Peer (P2P) pattern
    • Pipeline Pattern
  • Enterprise application architecture
  • IT/Software development
    • API development
    • ASP.Net MVC
    • ASP.NET Web API
    • C# development
    • RESTful APIs
  • Cybersecurity
    • Cross Site Scripting (XSS)
    • Reflected XSS
    • DOM-based XSS
    • Stored XSS attacks
    • Ransomware
    • cyber breaches
    • Static Application Security Testing (SAST)
  • Interview questions
    • Microsoft Azure Interview Questions
    • Amazon Web Services (AWS) Interview Questions
    • Agile Software development interview questions
    • C# interview questions with answers
    • Google analytics interview questions with answers
    • Javascript interview questions with answers
    • Python interview questions with answers
    • WordPress developer interview questions and answers
  • Cloud
    • Cloud computing
    • Infrastructure as a Service (IaaS)
    • Platform as a Service (PaaS)
    • Software as a Service (SaaS)
    • Microsoft Azure
      • Microsoft Azure Log Analytics
    • Zero Trust strategy
  • Azure Identity and Access Management
  • Azure Active Directory
  • Azure Defender
  • Azure security tools for logging and monitoring
  • Azure Sentinel
  • Azure Sentinel – Data connectors
  • Toggle search form
  • AWS DevOps Engineer Professional Exam Practice Questions – 14 AWS DevOps Engineer Professional Exam
  • Azure Serverless Computing Azure Serverless Computing
  • AWS DevOps Engineer Professional Exam Practice Questions – 5 AWS DevOps Engineer Professional Exam
  • Interview question: Can you return multiple values from a function in C#? C# development
  • Google analytics interview questions with answers Google analytics interview questions with answers
  • MongoDB Database
  • Interview question: How does C# differ from C++? C# development
  • Interview question: In c#, How can we create a function which can accept varying number of arguments? C# development

Top 50 C# interview questions with answers

Posted on March 7, 2022March 7, 2023 By DesiBanjara No Comments on Top 50 C# interview questions with answers

What is C#?

C# is a modern, object-oriented programming language that was developed by Microsoft. It is used to build applications for Windows, the web, and other platforms.

What are the key features of C#?

C# has several key features, including object-oriented programming, type safety, automatic memory management, and strong support for software components and assemblies.

What is the difference between value types and reference types in C#?

Value types are types that directly contain their data, such as integers, floats, and booleans. Reference types, on the other hand, store a reference to an object in memory, rather than the object itself.

What is the difference between a class and a struct in C#?

Classes are reference types that can have methods, properties, and fields. Structs are value types that can also have methods, properties, and fields, but they are typically used for small, simple data structures.

What is the difference between abstract classes and interfaces in C#?

Abstract classes are classes that cannot be instantiated, but can be used as a base class for other classes. Interfaces are similar, but they define a contract that a class must implement, rather than providing any implementation themselves.

What is inheritance in C#?

Inheritance is a mechanism by which a class can derive properties and behaviors from another class. The derived class, also known as the subclass, inherits all of the properties and behaviors of the base class, also known as the superclass.

What is polymorphism in C#?

Polymorphism is the ability of a method or object to take on different forms depending on the context in which it is used.

What is encapsulation in C#?

Encapsulation is the practice of hiding the internal details of a class or object from the outside world, and exposing only the necessary functionality through public methods and properties.

What is a constructor in C#?

A constructor is a special method that is used to create and initialize objects of a class. It is called automatically when an object is created, and is used to set the initial values of the object’s fields and properties.

What is a destructor in C#?

A destructor is a special method that is used to clean up an object before it is destroyed. It is called automatically when the object is no longer needed, and is used to release any resources that the object may have acquired during its lifetime.

What is a delegate in C#?

A delegate is a type that represents a method signature, and can be used to pass methods as arguments to other methods or to store them as variables.

What is an event in C#?

An event is a mechanism for notifying other objects that a particular action has occurred. It allows objects to register handlers for the event, which are called when the event is raised.

What is a namespace in C#?

A namespace is a way to organise classes and other types in a C# project. It allows multiple classes with the same name to coexist in the same project, as long as they are in different namespaces.

What is the difference between private and protected access modifiers in C#?

Private access modifiers restrict access to a member to only the class that defines it. Protected access modifiers allow access to the member from the defining class and any derived classes.

What is the difference between an abstract class and a sealed class in C#?

Abstract classes cannot be instantiated, but can be used as a base class for other classes. Sealed classes cannot be inherited from.

What is the difference between a static class and a non-static class in C#?

Static classes cannot be instantiated, and can only contain static members. Non-static classes can be instantiated, and can contain both static and non-static members.

What is the difference between an interface and an abstract class in C#?

Interfaces define a contract that a class must implement, while abstract classes can also provide some implementation themselves. Classes can implement multiple interfaces, but can only inherit from a single abstract class.

What is the difference between a value type and a reference type in C#?

Value types are stored on the stack, and are passed by value. Reference types are stored on the heap, and are passed by reference.

What is the difference between a struct and a class in C#?

Structs are value types, while classes are reference types. Structs are typically used for small, simple data structures, while classes are used for more complex objects.

What is a property in C#?

A property is a member of a class that provides access to a private field or other data. It allows the class to control how the data is accessed and modified, and can provide validation and other logic.

What is a method in C#?

A method is a member of a class that performs a specific action or computation. It can take arguments, and can return a value.

What is a field in C#?

A field is a member of a class that stores data. It can be public or private, and can have a default value.

What is the difference between a field and a property in C#?

Fields and properties both store data in a class, but properties provide a more controlled way of accessing and modifying the data. Properties can have custom logic for getting and setting the value, while fields do not.

What is a generic type in C#?

A generic type is a type that can be parameterised with one or more type parameters. This allows the same class or method to work with different types of data, without having to write separate code for each type.

What is the difference between a generic type and a non-generic type in C#?

Generic types can work with multiple types of data, while non-generic types can only work with a specific type of data. Generic types are often more flexible and reusable than non-generic types.

What is the difference between an interface and a class in C#?

Interfaces define a contract that a class must implement, while classes provide implementation and can be instantiated. Classes can inherit from other classes, while interfaces cannot.

What is a collection in C#?

A collection is a group of related objects, typically stored in an array or other data structure. C# provides several built-in collection classes, such as List and Dictionary, as well as the ability to create custom collections.

What is a LINQ in C#?

LINQ (Language Integrated Query) is a set of extensions to C# that provide a powerful, SQL-like syntax for querying and manipulating data in memory and in databases.

What is the difference between IEnumerable and IQueryable in C#?

IEnumerable is used for querying data that is already in memory, while IQueryable is used for querying data that is stored in a database or other external data source.

What is a lambda expression in C#?

A lambda expression is a concise way to define a delegate or an expression tree, without having to write a separate method. It allows for more flexible and readable code, especially when working with LINQ.

What is the difference between a lambda expression and an anonymous method in C#?

Lambda expressions are a more concise and expressive way to define delegates or expression trees, while anonymous methods are a more traditional way to define delegates.

What is a try-catch block in C#?

A try-catch block is a mechanism for handling exceptions in C#. Code that is likely to throw an exception is placed in a try block, and any exceptions that are thrown are caught and handled in a catch block.

What is an exception in C#?

An exception is a type of error that occurs when a program encounters an unexpected situation, such as trying to divide by zero or accessing a null reference.

What is the difference between a runtime exception and a compile-time exception in C#?

Compile-time exceptions are errors that are detected by the compiler, and prevent the program from being compiled. Runtime exceptions are errors that occur during program execution, and can cause the program to crash or behave unpredictably.

What is the purpose of the using statement in C#?

The using statement is used to ensure that a disposable object is properly disposed of, even if an exception is thrown. It can be used with any object that implements the IDisposable interface.

What is a delegate in C#?

A delegate is a type that represents a method signature, and can be used to pass methods as arguments to other methods or to store them as variables.

What is the difference between an event and a delegate in C#?

An event is a mechanism for notifying other objects that a particular action has occurred. It is based on the delegate type, and allows objects to register handlers for the event.

What is a thread in C#?

A thread is a separate path of execution within a program. C# provides several ways to create and manage threads, including the Thread class and the Task Parallel Library (TPL).

What is a mutex in C#?

A mutex (short for mutual exclusion) is a synchronisation primitive that is used to protect shared resources from simultaneous access by multiple threads. It can be used to ensure that only one thread at a time is allowed to access a critical section of code.

What is a semaphore in C#?

A semaphore is a synchronisation primitive that is used to control access to a shared resource by multiple threads. It allows a specified number of threads to access the resource simultaneously, while blocking additional threads until a thread exits the critical section.

What is a monitor in C#?

A monitor is a synchronisation primitive that is used to protect shared resources from simultaneous access by multiple threads. It provides a mechanism for threads to acquire and release ownership of a resource in a coordinated way, using the lock keyword.

What is a background thread in C#? A background thread is a thread that is created using the Thread class, and runs in the background without blocking the main thread of the program. It can be used to perform long-running tasks without interfering with the user interface or other critical tasks.

What is a task in C#? A task is a unit of work that can be executed asynchronously. It is part of the Task Parallel Library (TPL), and provides a higher-level abstraction for working with threads and other asynchronous programming patterns.

What is a parallel loop in C#? A parallel loop is a construct provided by the Task Parallel Library (TPL) that allows for parallel execution of a loop over a collection of items. It automatically splits the work into multiple threads or processes, and aggregates the results when the loop is complete.

What is the async/await pattern in C#? The async/await pattern is a language feature introduced in C# 5.0 that provides a simplified way to write asynchronous code. It allows methods to be marked as async, and uses the await keyword to suspend execution until an asynchronous operation is complete.

What is the difference between synchronous and asynchronous code in C#? Synchronous code executes sequentially, blocking the current thread until a particular operation is complete. Asynchronous code allows the current thread to continue executing while the operation is performed in the background, and uses callbacks or other mechanisms to notify the caller when the operation is complete.

What is serialization in C#? Serialization is the process of converting an object or a set of objects into a format that can be easily stored or transmitted, such as JSON or binary. C# provides several built-in serialization mechanisms, including the BinaryFormatter and the DataContractSerializer.

What is deserialization in C#? Deserialisation is the process of converting a serialized object or set of objects back into their original form. C# provides several built-in deserialization mechanisms, including the BinaryFormatter and the DataContractSerializer.

What is garbage collection in C#? Garbage collection is the process of automatically freeing up memory that is no longer being used by a program. It is managed by the .NET runtime, and ensures that programs do not run out of memory or leak memory over time.

What is the IDisposable interface in C#? The IDisposable interface is a marker interface that is used to indicate that an object requires cleanup or disposal when it is no longer needed. It is typically used for objects that allocate unmanaged resources, such as file handles or network connections.

What is the finalizer method in C#? The finalizer method (also known as the destructor) is a special method that is called by the garbage collector when an object is about to be destroyed. It can be used to perform cleanup or disposal of unmanaged resources.

What is reflection in C#?

Reflection is a feature in C# that allows for runtime introspection of types, objects, and assemblies. It provides a way to examine the metadata of a type, retrieve its properties and methods, and invoke them dynamically at runtime.

What is an attribute in C#? An attribute is a way to attach metadata to types, methods, properties, and other program elements in C#. It can be used to provide additional information about the program, such as debugging information or runtime behavior.

What is an extension method in C#? An extension method is a special type of static method that allows new methods to be added to existing types without modifying the type definition itself. It is often used to extend the functionality of existing classes or interfaces, such as the string or IEnumerable types.

What is a lambda expression in C#? A lambda expression is a concise way to define an anonymous method or function in C#. It is often used in LINQ queries and other functional programming constructs.

What is the difference between IQueryable and IEnumerable in C#? IQueryable and IEnumerable are both interfaces that are used to query data in LINQ. IQueryable is used for querying data that comes from a database or other remote source, while IEnumerable is used for querying in-memory collections.

What is a delegate in C#? A delegate is a type that represents a reference to a method or function in C#. It can be used to pass methods as arguments to other methods, or to define callbacks for asynchronous operations.

What is a multicast delegate in C#? A multicast delegate is a delegate that can reference multiple methods or functions. When a multicast delegate is invoked, all of the methods that it references are called in the order in which they were added to the delegate.

What is boxing in C#? Boxing is the process of converting a value type to a reference type, typically so that it can be stored in a collection or passed as an object parameter. It can be an expensive operation, as it involves creating a new object on the heap and copying the value into it.

What is unboxing in C#? Unboxing is the process of converting a reference type back into a value type. It involves extracting the value from the object on the heap and copying it back into the stack.

What is the difference between an abstract class and an interface in C#? An abstract class is a class that cannot be instantiated, and is typically used as a base class for other classes. It can contain both abstract and non-abstract members, and can provide default implementations for some of its members.

An interface is a contract that defines a set of members that a class must implement. It contains only method and property signatures, and cannot provide any implementation for its members.

What is a sealed class in C#? A sealed class is a class that cannot be inherited from, and is typically used for classes that provide a specific implementation that should not be modified.

What is a static class in C#? A static class is a class that can only contain static members, and cannot be instantiated. It is typically used for utility classes that provide global functionality or

C# interview questions with answers Tags:abstract class, C#, C# interview questions with answers, delegate in C#, Encapsulation, IEnumerable, inheritance in C#, IQueryable, LINQ, Polymorphism

Post navigation

Previous Post: Microsoft Azure – Security, compliance and identity concepts
Next Post: Javascript interview questions with answers

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.



Categories

  • Agile Software development
  • Amazon AWS Certification Exam
  • Amazon EC2
  • Amazon ECS
  • Amazon Web Services (AWS)
  • Apache Kafka
  • API development
  • Apple Mac
  • ASP.NET Core
  • ASP.Net MVC
  • ASP.NET Web API
  • Atlassian Jira
  • AWS DevOps Engineer Professional Exam
  • AWS Lambda
  • AZ-300: Microsoft Azure Architect Technologies Exam
  • Azure
  • Azure Active Directory
  • Azure AI and ML services
  • Azure Analytics Services
  • Azure App Service
  • Azure Application Gateway
  • Azure Archive Storage
  • Azure Blob Storage
  • Azure Cognitive Services
  • Azure Compute
  • Azure Container Instances (ACI)
  • Azure Core Services
  • Azure Data and Storage
  • Azure Data Factory
  • Azure Data Lake Storage
  • Azure Database Services
  • Azure Databricks
  • Azure Defender
  • Azure Devops
  • Azure Disk Storage
  • Azure File Storage
  • Azure Functions
  • Azure IaaS
  • Azure Identity and Access Management
  • Azure Internet of Things (IoT)
  • Azure Kubernetes Service (AKS)
  • Azure landing zone
  • Azure Load Balancer
  • Azure Logic Apps
  • Azure Machine Learning
  • Azure Machine Learning
  • Azure Migration
  • Azure Mobile Apps
  • Azure Networking – VNET
  • Azure Networking services
  • Azure Pricing and Support
  • Azure Queue Storage
  • Azure Resource Manager
  • Azure Security
  • Azure Security Center
  • Azure security tools for logging and monitoring
  • Azure Security, Privacy, Compliance, and Trust
  • Azure Sentinel
  • Azure Sentinel – Data connectors
  • Azure Serverless Computing
  • Azure Service Level Agreement (SLA)
  • Azure SQL
  • Azure SQL Database
  • Azure Storage
  • Azure Storage services
  • Azure Stream Analytics
  • Azure Synapse Analytics
  • Azure Table Storage
  • Azure Virtual Machine
  • Azure VNET
  • Business
  • C# development
  • C# interview questions with answers
  • CDA (Clinical Document Architecture)
  • ChatGPT
  • CI/CD pipeline
  • CISSP certification
  • Cloud
  • Cloud computing
  • Cloud Computing Concepts
  • Cloud services
  • COBIT
  • Command Query Responsibility Segregation (CQRS) Pattern
  • Configure SSL offloading
  • Content management system
  • Continuous Integration
  • conversational AI
  • Cross Site Scripting (XSS)
  • cyber breaches
  • Cybersecurity
  • Data Analysis
  • Database
  • DevOps
  • DevSecOps
  • Docker
  • DOM-based XSS
  • Domain-Driven Design (DDD)
  • Dynamic Application Security Testing (DAST)
  • Enterprise application architecture
  • Event-Driven Architecture
  • GIT
  • git
  • gmail api
  • Google
  • Google Ads
  • Google AdSense
  • Google Analytics
  • Google analytics interview questions with answers
  • Google Cloud Platform (GCP)
  • Google Docs
  • Google Drive
  • Google Maps
  • Google search console
  • Healthcare Interoperability Resources
  • Hexagonal Architecture Pattern
  • HL7 vs FHIR
  • HTML
  • Information security
  • Infrastructure as a Service (IaaS)
  • Internet of Things (IoT)
  • Interview questions
  • Introduction to DICOM
  • Introduction to FHIR
  • Introduction to HL7
  • IT governance
  • IT Infrastructure networking
  • IT/Software development
  • Javascript interview questions with answers
  • Layered Pattern
  • Leadership Quote
  • Life lessons
  • Load Balancing Algorithms
  • Low-code development platform
  • Microservices
  • Microservices
  • Microsoft
  • Microsoft 365 Defender
  • Microsoft AI-900 Certification Exam
  • Microsoft AZ-104 Certification Exam
  • Microsoft AZ-204 Certification Exam
  • Microsoft AZ-900 Certification Exam
  • Microsoft Azure
  • Microsoft Azure certifications
  • Microsoft Azure Log Analytics
  • Microsoft Cloud Adoption Framework
  • Microsoft Exam AZ-220
  • Microsoft Exam AZ-400
  • Microsoft Excel
  • Microsoft Office
  • Microsoft Teams
  • Microsoft Teams
  • Microsoft word
  • Model-View-Controller (MVC) Pattern
  • Monitoring and analytics
  • NoSQL
  • OpenAI
  • OutSystems
  • Peer-to-Peer (P2P) pattern
  • Pipeline Pattern
  • PL-100: Microsoft Power Platform App Maker
  • PL-200: Microsoft Power Platform Functional Consultant Certification
  • PL-900: Microsoft Power Platform Fundamentals
  • Platform as a Service (PaaS)
  • postman
  • Postman
  • Project management
  • Python interview questions with answers
  • Ransomware
  • Reflected XSS
  • RESTful APIs
  • SC-100: Microsoft Cybersecurity Architect
  • Scrum Master Certification
  • Service-oriented architecture (SOA)
  • Software architecture
  • Software as a Service (SaaS)
  • SonarQube
  • Splunk
  • SQL
  • SQL Azure Table
  • SQL Server
  • Static Application Security Testing (SAST)
  • Stored XSS attacks
  • Table Storage
  • Test Driven Development (TDD)
  • Top technology trends for 2023
  • Uncategorized
  • User Experience (UX) design
  • Version control system
  • WCF (Windows Communication Foundation)
  • Web development
  • WordPress
  • WordPress developer interview questions and answers
  • Zero Trust strategy



Recent Posts

  • Azure Security Center
  • Azure Application Gateway
  • Configure SSL offloading with Azure Load Balancer
  • Azure load balancer – Load Balancing Algorithms
  • Azure Load Balancer

Recent Comments

    • What is Docker? Docker
    • Microsoft Cloud Adoption Framework Microsoft Azure
    • Configure SSL offloading with Azure Load Balancer Azure Load Balancer
    • Azure Blob Storage Azure Blob Storage
    • Design a zero trust strategy and architecture in azure Zero Trust strategy
    • Azure Web Apps Azure
    • Amazon Web Services (AWS) Amazon Web Services (AWS)
    • Life lessons – Do not let the behavior of others destroy your inner peace Life lessons

    Copyright © 2023 Desi banjara.

    Powered by PressBook News WordPress theme