Latest .NET interview questions with explanations

•  .NET interview questions with explanations

• What is .NET Framework? 

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• The .NET Framework is a software development framework developed by Microsoft. 

• It provides a programming model, libraries, and runtime for building and executing applications on Windows-based systems.

•  It supports multiple programming languages like C#, VB.NET, and F#, and

•  allows developers to build a wide range of applications, including 

• desktop applications, web applications, and mobile applications.

• What is the difference between .NET Framework and .NET Core?

•  .NET Framework and .NET Core are two different implementations of the .NET platform. 

• .NET Framework is the traditional full-featured framework that runs on Windows only, 

• while .NET Core is a cross-platform, open-source framework that runs on Windows, macOS, and Linux. 

• .NET Core is also more modular and lightweight compared to the .NET Framework.

• What is C#? 

  
  
  

• C# (pronounced C sharp) is a programming language developed by Microsoft.

•  It is a strongly-typed, object-oriented language that is used primarily for building applications on the .NET platform. 

• C# is similar to Java in terms of syntax and has a rich set of features 

• that make it a powerful language for developing a wide variety of applications.

• Explain the difference between value types and reference types in C#.

•  In C#, value types are types that hold their data directly and are stored in the stack memory. 

• Examples of value types include integers (int), floating-point numbers (float), and structs. 

• Reference types, on the other hand, store a reference to their data in the stack memory, while the actual data is stored in the heap memory. 

• Examples of reference types include classes, interfaces, and delegates. 

• Value types are typically small in size and have a short lifespan, while reference types can be larger and have a longer lifespan.

• What are the different types of collections in .NET? 

  • ArrayList: A dynamically resizable array.
  • List<T>: A generic list that can store elements of a specific type.
  • Dictionary<TKey, TValue>: A collection of key-value pairs.
  • HashSet<T>: A collection of unique elements.
  • Queue<T>: A first-in, first-out (FIFO) collection.
  • Stack<T>: A last-in, first-out (LIFO) collection.
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• .NET provides several types of collections to store and manipulate data. Some of the commonly used collections are:

• What is ASP.NET?

•  ASP.NET is a web development framework provided by Microsoft for building web applications.

•  It allows developers to build dynamic websites and web services using languages

•  like C# or VB.NET. ASP.NET provides various features like server controls, data binding,

•  authentication, and state management to simplify web application development.

• Explain the concept of garbage collection in .NET.

•  Garbage collection is a process in .NET that automatically manages the memory used by an application.

•  It frees up memory occupied by objects that are no longer referenced by the application, ensuring efficient memory usage. 

• The garbage collector identifies and releases the memory of such objects, allowing

•  developers to focus on writing code without explicitly deallocating memory.

• What are delegates in C#? 

  
  
  

• Delegates in C# are similar to function pointers in other languages. 

• They are used to define and encapsulate a reference to a method with a specific signature. 

• Delegates allow methods to be assigned to variables, passed as arguments to other methods, and invoked at a later time. 

• They are commonly used in event handling and callback scenarios.

• What is the role of the Global Assembly Cache (GAC) in .NET? 

• The Global Assembly Cache (GAC) is a centralized cache provided by .NET to store

•  shared assemblies that can be accessed by multiple applications.