100 Must-Know .NET Core Interview Questions and Answers 2024

.NET Core Fundamentals

1.
What is .NET Core and how does it differ from the .NET Framework?
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2.
Describe the cross-platform capabilities of .NET Core.
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3.
What are the main components of the .NET Core architecture?
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4.
Explain the .NET Core CLI and its primary functions.
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5.
How do you create a new .NET Core project using the CLI?
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6.
Discuss the purpose and use of a csproj file in a .NET Core project.
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7.
What is the runtime and SDK in .NET Core?
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8.
How would you manage different versions of the .NET Core SDK on the same machine?
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9.
What is the purpose of the global.json file?
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10.
Can you explain the Directory Structure of a typical .NET Core project?
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.NET Core Dependencies and Libraries

11.
How do you add and manage NuGet packages in a .NET Core project?
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12.
Explain the role of the NuGet package manager.
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13.
Describe the process of publishing a .NET Core application.
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14.
What is a .NET Standard and how does it relate to .NET Core?
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15.
How do you create a class library in .NET Core?
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.NET Core Web Development

16.
Describe the MVC pattern in .NET Core.
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17.
How do you set up a Web API in a .NET Core project?
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18.
What are middleware components in .NET Core?
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19.
Explain how static files are served in a .NET Core web application.
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20.
Discuss the use and configuration of the appsettings.json file.
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21.
What is Dependency Injection (DI) in .NET Core?
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22.
How do you implement custom services and use DI in .NET Core?
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23.
What are environment variables and how do they work in .NET Core?
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24.
How does routing work in a .NET Core MVC application?
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25.
What are Razor Pages in .NET Core?
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.NET Core Advanced Topics

26.
Explain the concept of Tag Helpers in ASP.NET Core.
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27.
How do you ensure the security of a .NET Core application?
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28.
What is an EF Core and how do you use it with .NET Core?
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29.
How do you handle migrations in EF Core?
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30.
Describe how to cache data in a .NET Core web application.
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31.
What are SignalR and its use cases in .NET Core?
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32.
How can you build real-time applications using .NET Core?
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33.
Explain the role of a kestrel server in .NET Core.
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34.
What is Blazor and how does it integrate with .NET Core?
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35.
How do you perform logging in .NET Core?
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.NET Core Performance and Optimization

36.
What features does .NET Core include to improve application performance?
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37.
How can you monitor performance in a .NET Core application?
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38.
Discuss performance profiling tools suitable for .NET Core.
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39.
What is the purpose of asynchronous programming in .NET Core?
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40.
How do you identify and resolve memory leaks in a .NET Core application?
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.NET Core Testing and Debugging

41.
How do you write unit tests in a .NET Core application?
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42.
Describe the use of xUnit, NUnit, and MSTest Frameworks.
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43.
What are Integration Tests and how do they differ from Unit Tests?
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44.
Explain the use of the Logging API for troubleshooting.
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45.
What is the TDD approach and how can it be implemented in .NET Core development?
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.NET Core Deployment and Configuration

46.
What is Docker and how can it be used with .NET Core?
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47.
How can you deploy a .NET Core application to the cloud (e.g., Azure)?
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48.
What are some common security considerations when deploying a .NET Core application?
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49.
Discuss the strategies for scaling .NET Core applications.
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50.
How do you configure HTTPS and SSL in a .NET Core Web Application?
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.NET Core and Cloud Integration

51.
Explain how you can integrate Azure services into a .NET Core application.
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52.
How do you use Azure DevOps for CI/CD with a .NET Core project?
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53.
What are the best practices for building a microservices architecture in .NET Core?
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54.
How does .NET Core work with container orchestration tools like Kubernetes?
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55.
Describe serverless computing with .NET Core on platforms like AWS Lambda.
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.NET Core Data Access

56.
How do you work with databases using Entity Framework Core?
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57.
What is the purpose of the DbContext in EF Core?
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58.
Explain the Code-First and Database-First approaches in EF Core.
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59.
How do you handle database transactions in .NET Core?
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60.
Discuss using Dapper as an alternative to Entity Framework in _.NET Core applications.
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.NET Core Design Patterns and Practices

61.
What are some popular design patterns used in .NET Core applications?
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62.
How do you implement Repository and Unit of Work patterns in .NET Core?
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63.
Explain CQRS and how it applies to .NET Core.
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64.
Discuss the importance of domain-driven design (DDD) in .NET Core.
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65.
How does .NET Core support the SOLID principles in software development?
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.NET Core Interoperability and Legacy Systems

66.
How can you integrate a .NET Core application with legacy .NET Framework apps?
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67.
Can you consume COM objects in .NET Core?
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68.
Discuss strategies for migrating from .NET Framework to .NET Core.
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69.
What are the challenges associated with interoperability in .NET Core?
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.NET Core CLI and Tools

70.
How do you manage user secrets in development with the .NET Core CLI?
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71.
What is the watch command in the .NET Core CLI and when would you use it?
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72.
Explain the dotnet ef CLI tool and its primary uses.
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73.
Describe the use of scaffolding in .NET Core.
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74.
How do you use the CLI to run and debug .NET Core applications?
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.NET Core Configuration and Settings

75.
How do you manage configurations and settings in .NET Core for multiple environments?
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76.
What is an IOptions pattern and how can it be used for configuration?
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77.
Describe the role and configuration of middleware in .NET Core.
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78.
Explain how Configuration Builders are used in .NET Core.
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79.
How do you read command-line arguments in a .NET Core application?
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.NET Core and Security

80.
How does .NET Core handle authentication and authorization?
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81.
What is the Identity system in .NET Core?
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82.
Describe how to implement JWT authentication in .NET Core.
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83.
Discuss the use of HTTPS redirection and HSTS in .NET Core apps.
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84.
How can you secure API endpoints in .NET Core?
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Contemporary .NET Core

85.
What is the future of .NET Core with upcoming releases of .NET 5 and later?
Answer:
86.
How has the introduction of .NET 5 changed the way .NET Core is used?
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87.
Discuss the role of .NET Core in IoT development.
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88.
What impact does .NET Core have on desktop application development with technologies like MAUI?
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89.
Explain the support for gRPC in .NET Core.
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.NET Core and Front-End Frameworks

90.
How can you integrate Angular, React, or Vue.js with a .NET Core Web API?
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91.
What is a SPA (Single Page Application) template in .NET Core?
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92.
Discuss server-side rendering with JavaScript frameworks in the context of .NET Core.
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.NET Core Advanced Features

93.
What new features are introduced in the latest version of .NET Core?
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94.
How does .NET Core support machine learning with ML.NET?
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95.
Discuss Source Generators and their use in .NET Core.
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96.
What are dynamic compilations and how does .NET Core handle them?
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97.
Explain the support for local functions in .NET Core.
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98.
Discuss null reference types in C# 8.0 and how they affect .NET Core development.
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.NET Core Community and Support

99.
How does the .NET Core open source community contribute to the framework’s development?
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100.
Discuss the support options available for .NET Core developers.
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100 .NET Core interview questions

What is .NET Core and how does it differ from the .NET Framework?

Describe the cross-platform capabilities of .NET Core.

What are the main components of the .NET Core architecture?

Explain the .NET Core CLI and its primary functions.

How do you create a new .NET Core project using the CLI?

Discuss the purpose and use of a csproj file in a .NET Core project.

What is the runtime and SDK in .NET Core?

How would you manage different versions of the .NET Core SDK on the same machine?

What is the purpose of the global.json file?

Can you explain the Directory Structure of a typical .NET Core project?

How do you add and manage NuGet packages in a .NET Core project?

Explain the role of the NuGet package manager.

Describe the process of publishing a .NET Core application.

What is a .NET Standard and how does it relate to .NET Core?

How do you create a class library in .NET Core?

Describe the MVC pattern in .NET Core.

How do you set up a Web API in a .NET Core project?

What are middleware components in .NET Core?

Explain how static files are served in a .NET Core web application.

Discuss the use and configuration of the appsettings.json file.

What is Dependency Injection (DI) in .NET Core?

How do you implement custom services and use DI in .NET Core?

What are environment variables and how do they work in .NET Core?

How does routing work in a .NET Core MVC application?

What are Razor Pages in .NET Core?

Explain the concept of Tag Helpers in ASP.NET Core.

How do you ensure the security of a .NET Core application?

What is an EF Core and how do you use it with .NET Core?

How do you handle migrations in EF Core?

Describe how to cache data in a .NET Core web application.

What are SignalR and its use cases in .NET Core?

How can you build real-time applications using .NET Core?

Explain the role of a kestrel server in .NET Core.

What is Blazor and how does it integrate with .NET Core?

How do you perform logging in .NET Core?

What features does .NET Core include to improve application performance?

How can you monitor performance in a .NET Core application?

Discuss performance profiling tools suitable for .NET Core.

What is the purpose of asynchronous programming in .NET Core?

How do you identify and resolve memory leaks in a .NET Core application?

How do you write unit tests in a .NET Core application?

Describe the use of xUnit, NUnit, and MSTest Frameworks.

What are Integration Tests and how do they differ from Unit Tests?

Explain the use of the Logging API for troubleshooting.

What is the TDD approach and how can it be implemented in .NET Core development?

What is Docker and how can it be used with .NET Core?

How can you deploy a .NET Core application to the cloud (e.g., Azure)?

What are some common security considerations when deploying a .NET Core application?

Discuss the strategies for scaling .NET Core applications.

How do you configure HTTPS and SSL in a .NET Core Web Application?

Explain how you can integrate Azure services into a .NET Core application.

How do you use Azure DevOps for CI/CD with a .NET Core project?

What are the best practices for building a microservices architecture in .NET Core?

How does .NET Core work with container orchestration tools like Kubernetes?

Describe serverless computing with .NET Core on platforms like AWS Lambda.

How do you work with databases using Entity Framework Core?

What is the purpose of the DbContext in EF Core?

Explain the Code-First and Database-First approaches in EF Core.

How do you handle database transactions in .NET Core?

Discuss using Dapper as an alternative to Entity Framework in _.NET Core applications.

What are some popular design patterns used in .NET Core applications?

How do you implement Repository and Unit of Work patterns in .NET Core?

Explain CQRS and how it applies to .NET Core.

Discuss the importance of domain-driven design (DDD) in .NET Core.

How does .NET Core support the SOLID principles in software development?

How can you integrate a .NET Core application with legacy .NET Framework apps?

Can you consume COM objects in .NET Core?

Discuss strategies for migrating from .NET Framework to .NET Core.

What are the challenges associated with interoperability in .NET Core?

How do you manage user secrets in development with the .NET Core CLI?

What is the watch command in the .NET Core CLI and when would you use it?

Explain the dotnet ef CLI tool and its primary uses.

Describe the use of scaffolding in .NET Core.

How do you use the CLI to run and debug .NET Core applications?

How do you manage configurations and settings in .NET Core for multiple environments?

What is an IOptions pattern and how can it be used for configuration?

Describe the role and configuration of middleware in .NET Core.

Discuss the purpose and use of a `csproj` file in a .NET Core project.

What is the purpose of the `global.json` file?