8 Most Asked .NET Interview Questions & Answers from Developers

February 23, 2024
8 Most Asked .NET Interview Questions & Answers from Developers

In the .NET environment, technical interviews are essential for evaluating a candidate’s competencies, expertise, and problem-solving capabilities. During these interviews, employers assess a candidate’s competency through a number of .NET interview questions, including best practices, framework elements, and language syntax. Technical interviews need preparation in order for applicants to demonstrate their competence and differentiate themselves from the competition.

We have compiled the most asked and relevant .NET interview questions in this blog post for you. But first, you need to understand what the .NET framework is and how it works.

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Understanding .NET for Interview Questions

Microsoft created the .NET framework, which offers a platform for executing, troubleshooting, and deploying code on websites and apps through the use of features and tools, including classes, libraries, and APIs. Object-oriented programming is used in this framework.

For writing .NET framework apps, you may utilize languages like C#, Cobol, VB, F#, Perl, etc. On Windows, this Framework allows desktop apps, websites, services, and much more. It offers features like parallelism, reflection, automatic memory management, generic types, and more. These features will facilitate the efficient and easier construction of superior client and online apps.

Microsoft created .NET Core, an open-source, free, general-purpose programming platform, as an upgraded version of the .NET framework. A program may operate on several operating systems, including Windows, Linux, and macOS, thanks to the cross-platform framework .NET Core. Several application types, including mobile, online, IoT, cloud, microservices, machine learning, and gaming, may be developed with this framework.

Top .NET Interview Questions & Answers for Developers

Here are the most common .NET developer interview questions:

1. Explain inheritance and its importance

One of the key ideas of object-oriented programming, along with encapsulation and polymorphism, is inheritance. Because of inheritance, programmers may design new classes that extend, reuse, and change the functionality specified in existing classes. Development is accelerated, and code is reused as a result. Developers may construct and debug a single class using inheritance and then use the same code to create more classes based on it. The base class is the one whose members are inherited, and the derived class is the one that inherits those members. All .NET classes are inheritable by default. This .NET interview question is often asked by the interviewer.

2. What is a class and an object?

An object is an instance of a class, and a class is the definition of an object. The class may be thought of as an object template, as it lists all of the attributes, functions, states, and actions that the implementing object will have. As previously stated, a class is not an object until it is instantiated; an object is an instance of a class. One class of object may have several instances, each with unique attributes.

3. Explain managed and unmanaged code

The code produced by the .NET compiler is known as managed code. Since the CLR (Common Language Runtime), not the operating system, is responsible for executing it, it is independent of the architecture of the target computer. A few advantages that CLR and managed code provide to developers include trash collection, type checking, and exception handling.

Unmanaged code depends on the target machine’s architecture and is immediately compiled into native machine code. The operating system directly handles its execution. The developer must ensure that he is manually handling errors, type safety, and memory use and allocation in the unmanaged code.

The C# and Visual Basic compilers provide managed code for .NET. The application must be developed in C or C++ in order to receive unmanaged code.

4. Differentiate between “while” and “for” loop

In situations where a piece of code has to run repeatedly, both loops are employed. The distinction lies in the fact that the “for” loop is employed when you are aware of the number of times you must loop over the code. The “while” loop, on the other hand, is employed when you need to keep doing something until a certain assertion holds true.

5. What is LINQ?

One of the .NET core interview questions is about LINQ. Language Integrated Query, or LINQ, was first released with Visual Studio 2008. By including sets of new standard query operators that enable data manipulation independent of the data source, LINQ is a collection of features that expands query capabilities to the .NET language syntax. XML documents, SQL Server databases, ADO .NET datasets, .NET Framework collections, and any collection of objects that accept “IEnumerable” or the general “IEnumerable<T>” interface in both C# and Visual Basic are supported data sources. To put it briefly, LINQ connects the worlds of objects and data.

6. What is the difference between Stack and Heap?

The basic answer is that stored reference types (types inherited from “System.Object”) are kept in the Heap while stored value types (types inherited from “System.Value” Type) are stored in the Stack.
Since every operating thread has its own Stack, we can say that the Stack is in charge of monitoring what is really running as well as the location of each thread. On the other side, the Heap is in charge of tracking the data, or more specifically, the objects.

7. What is a delegate?

The equivalent of a function pointer in C or C++ is a delegate in .NET. Programmers can encapsulate a method reference inside a delegate object by using a delegate. The preferred method may then be called by the code that receives the delegate object; this eliminates the need to know which method will be called at build time. Furthermore, we may construct custom events inside of classes using a delegate.

8. How is a generic action implemented in WebAPI?

It isn’t feasible since the WebAPI runtime requires advanced knowledge of the method signatures.

Wrap Up

The above-mentioned list of .NET interview questions is often repeated by the interviewers. The main purpose of the full-stack .NET framework for software development is to create scalable, large-scale corporate applications. The market for the .NET framework is vast. This framework is adaptable and easy to use, and it works well with various technologies.

We are certain that this .NET interview questions guide will provide you with enough details and a decent understanding of the typical questions that will be asked during an interview.

Read more: 10 Top Interview Questions to Ask Software Engineers in Interviews

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