Become an .NET Expert – Dot Net Interview Questions

Dot Net Interview Questions & Answer

Introduction of dot net interview questions:

Dot Net Core 7 is the latest version of the .NET Core framework, a cross-platform, open-source development framework by Microsoft. It empowers developers to build modern, high-performance applications for web, mobile, cloud, gaming, IoT, and more. As companies embrace .NET Core 7 for their projects, the demand for skilled developers is soaring. This article aims to equip you with the knowledge and confidence to tackle Dot Net interview questions with ease.

Dot Net Core 7 Interview Questions

Dot NET Core 7 interview Questions

1. What are the Key Features of Dot Net Core 7?

Example: One of the key features of Dot Net Core 7 is the introduction of nullable reference types. This feature allows developers to annotate variables and parameters as nullable or non-nullable, reducing the risk of null reference exceptions. For example:

public string? GetFullName(string firstName, string? lastName)
    return lastName != null ? $"{firstName} {lastName}" : firstName;

In this example, the lastName parameter is marked as nullable, and the method safely handles null values.

2. How Does Dot Net Core 7 Differ from Previous Versions?

Example: Dot Net Core 7 introduces enhanced support for Source Generators, a new feature that allows you to generate C# source code at compile-time. For instance:

public class MyClass
    // Your class implementation here

public class MyCustomAttribute : Attribute { }

In this example, the Source Generator processes the MyClass type and generates additional code based on the presence of the MyCustomAttribute.

3. What Are the Advantages of Using Dot Net Core 7 for Cross-Platform Development?

Example: With Dot Net Core 7, you can develop cross-platform applications with ease. For example, consider a web application that needs to run on both Windows and Linux servers. Dot Net Core 7 allows you to publish the application as a self-contained deployment, ensuring it runs efficiently on both platforms without any platform-specific modifications.

4. How Does the Dot Net Core 7 CLI Facilitate the Development Process?

Example: The Dot Net Core 7 CLI provides a simple and powerful way to manage projects and build applications. For instance, creating a new project can be done with a single command:

bash Copy code
dotnet new console -n MyConsoleApp

This command creates a new console application named MyConsoleApp.

5. What Are Self-Contained and Framework-Dependent Deployments in Dot Net Core 7?

Example: When deploying a Dot Net Core 7 application, you have two options: self-contained and framework-dependent deployments. For example, when deploying a web application, you can use a self-contained deployment to bundle the .NET Core runtime with your application, making it independent of the system’s installed runtime.

This article “Dot NET Core 7 Interview Questions” should be helpful for *increase the .NET Core knowledge

6. What Is the Role of ASP.NET Core 7 in Dot Net?

Example: ASP.NET Core is a versatile framework in Dot Net Core 7 for building web applications. For example, consider creating a basic API using ASP.NET Core:

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public class SampleController : ControllerBase
    public IActionResult Get()
        return Ok("Hello, Dot Net Core 7!");

In this example, the SampleController responds with a simple message when accessed via HTTP GET.

7. How Does Dependency Injection Work in ASP.NET Core?

Example: Dependency Injection (DI) is a powerful pattern in ASP.NET Core, enhancing code maintainability and testability. For instance, consider a service that calculates the total price of a shopping cart:

This is the most important dot net interview question

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public class ShoppingCart
    private readonly IProductService _productService;

    public ShoppingCart(IProductService productService)
        _productService = productService;

    public decimal CalculateTotalPrice(IEnumerable<string> productIds)
        decimal totalPrice = 0;
        foreach (var productId in productIds)
            var productPrice = _productService.GetProductPrice(productId);
            totalPrice += productPrice;
        return totalPrice;

In this example, the ShoppingCart class uses constructor injection to receive an instance of the IProductService interface, allowing it to calculate the total price of the products in the shopping cart.

8. What Are Middleware in ASP.NET Core, and How Do They Impact the Request Pipeline?

Example: Middleware components in ASP.NET Core process HTTP requests and responses. For example, let’s create a custom middleware that logs each request’s URL:

This is the most important Dot Net Core 7 Interview questions

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public class RequestLoggerMiddleware
    private readonly RequestDelegate _next;

    public RequestLoggerMiddleware(RequestDelegate next)
        _next = next;

    public async Task Invoke(HttpContext context)
        var requestUrl = context.Request.Path;
        Console.WriteLine($"Request URL: {requestUrl}");
        await _next(context);

In this example, the RequestLoggerMiddleware logs the request URL before passing it to the next middleware in the pipeline.

9. Exploring Hosting Models in ASP.NET Core: In-Process vs. Out-of-Process

Example: ASP.NET Core supports two hosting models: in-process and out-of-process. For example, when hosting an ASP.NET Core application on IIS, you can choose either the in-process hosting model, where the application runs within the IIS worker process, or the out-of-process model, where the application runs in a separate process.

10. How Does Kestrel Contribute to the ASP.NET Core Web Server Ecosystem?

Example: Kestrel is the web server used by default in ASP.NET Core. For example, when running a web application with Kestrel, you can customize its options, such as configuring the server to listen on specific ports or binding to specific IP addresses.

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public class Program
    public static void Main(string[] args)
        var host = new HostBuilder()
            .ConfigureWebHostDefaults(webBuilder =>
                webBuilder.UseKestrel(options =>
                    options.Listen(IPAddress.Loopback, 5000); // Listen on localhost:5000


In this example, the application is configured to listen on localhost:5000 using Kestrel.

11. How to Secure Your Dot Net Core 7 Applications: Best Practices and Security Mechanisms

Example: Securing Dot Net Core 7 applications is crucial to protect against vulnerabilities. For example, consider implementing authentication and authorization using ASP.NET Core Identity:

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services.AddIdentity<ApplicationUser, IdentityRole>()

In this example, ASP.NET Core Identity is configured to manage user accounts and roles.

12. Understanding Razor Pages in Dot Net Core 7: The Evolution of MVC

Example: Razor Pages is a new feature in Dot Net Core 7 that simplifies the development of web pages. For example, create a Razor Page to display a list of products:

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@model ProductModel
<h2>Product List</h2>
    @foreach (var product in Model.Products)

In this example, the Razor Page displays a list of products retrieved from the ProductModel class.

13. Leveraging Entity Framework Core in Dot Net Core 7 for Database Access

Example: Entity Framework Core is a powerful ORM in Dot Net Core 7 for database access. For example, create a simple data model and perform CRUD operations:

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public class Product
    public int Id { get; set; }
    public string Name { get; set; }
    public decimal Price { get; set; }

// Perform CRUD operations
var product = new Product { Name = "Sample Product", Price = 19.99 };

In this example, a Product entity is created and persisted to the database using Entity Framework Core.

14. How to Handle and Log Errors Effectively in Dot Net Core 7 Applications

Example: Error handling and logging are vital for a robust application. For example, implement a custom exception filter to handle and log exceptions:

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public class CustomExceptionFilter : IExceptionFilter
    public void OnException(ExceptionContext context)
        var exception = context.Exception;
        // Log the exception details
        Console.WriteLine($"An exception occurred: {exception.Message}");

In this example, the CustomExceptionFilter logs any exceptions that occur during the request processing.

15. Exploring Tag Helpers in ASP.NET Core: Enhancing View Components

Example: Tag Helpers are a powerful feature in ASP.NET Core for creating reusable and clean view components. For example, create a custom tag helper to display formatted dates:

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<!-- Usage in Razor view -->
<my-date value="DateTime.Now"></my-date>

<!-- Custom Tag Helper implementation -->
public class MyDateTagHelper : TagHelper
    public DateTime Value { get; set; }

    public override void Process(TagHelperContext context, TagHelperOutput output)
        output.TagName = "span";

In this example, the MyDateTagHelper formats the provided date and renders it as a span element.

16. Understanding the .csproj File Format in Dot Net Core 7 Projects

Example: The .csproj file is a central part of a Dot Net Core 7 project. For example, add a NuGet package reference in the .csproj file:

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    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />

In this example, the Newtonsoft.Json NuGet package is added as a dependency to the project.

17. What’s New in Dot Net Core 7: A Closer Look at the Latest Updates and Improvements

Example: Dot Net Core 7 introduces various new features and improvements. For example, take a closer look at the new Nullable attributes introduced in C# 8:

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#nullable enable
public class Person
    public string FirstName { get; set; }
    public string? MiddleName { get; set; }
    public string LastName { get; set; }

In this example, the MiddleName property is marked as nullable, indicating that it can have a null value.

18. Frequently Asked Questions (FAQs) with Answers

Q: Can You Provide an Example of Using Dependency Injection in Dot Net Core 7?

Example: Absolutely! Consider the following example of using DI in a controller:

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public class SampleController : ControllerBase
    private readonly ILogger<SampleController> _logger;

    public SampleController(ILogger<SampleController> logger)
        _logger = logger;

    public IActionResult Get()
        _logger.LogInformation("SampleController Get method called.");
        return Ok("Hello, Dot Net Core 7!");

In this example, the SampleController class receives an instance of ILogger<SampleController> through DI, allowing it to log information.

Q: Is Entity Framework Core Suitable for Large-Scale Applications?

Example: Absolutely! Entity Framework Core is designed to handle large-scale applications efficiently. For example, optimize database queries using EF Core’s LINQ to Entities:

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var products = context.Products
    .Where(p => p.Price > 50)
    .OrderByDescending(p => p.Price)

In this example, the LINQ query retrieves the top 10 products with prices greater than 50 from the database.

Q: How Can I Deploy a Dot Net Core 7 Application to Azure?

Example: Deploying a Dot Net Core 7 application to Azure is straightforward. For example, you can use Azure App Service for easy deployment:

  1. Create an Azure App Service instance.
  2. Use Azure DevOps or GitHub Actions for continuous integration and deployment.
  3. Deploy the application using the Azure CLI or Azure Portal.

Q: Is Dot Net Core 7 Suitable for Game Development?

Example: While Dot Net Core 7 is primarily focused on web, cloud, and mobile applications, it can be used for game development. For example, Unity, a popular game engine, supports .NET Core scripting, allowing you to build games with C# and .NET Core.

Q: Can You Explain How to Use Configuration in Dot Net Core 7?

Example: Certainly! Dot Net Core 7 provides a flexible configuration system. For example, use appsettings.json to configure settings:

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  "Logging": {
    "LogLevel": "Debug"
  "MyAppSettings": {
    "ApiKey": "my-api-key",
    "ConnectionStrings": {
      "DefaultConnection": "my-connection-string"

In this example, the MyAppSettings section contains API key and connection string configurations.

Q: How Can I Improve Performance in Dot Net Core 7 Applications?

Example: Improving performance in Dot Net Core 7 applications involves various optimizations. For example, enable response caching to reduce server load:

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[ResponseCache(Duration = 3600)]
public IActionResult Get()
    // Your action logic here

In this example, the response from the Get action is cached for one hour.


Congratulations! You’ve learned the essential Dot Net Core 7 interview questions with practical examples. Armed with this knowledge, you’ll confidently impress interviewers and demonstrate your expertise in Dot Net Core 7. Keep exploring the framework’s features, practicing coding, and stay updated with the latest advancements to excel in your Dot Net Core 7 journey.

Thank You,

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