VB.NET Interview Questions and Answers for 10 years experience

0
100 VB.NET Interview Questions & Answers (10+ Years Experience)

  1. What is the difference between a `Structure` and a `Class` in VB.NET?

    • Answer: Structures are value types, while classes are reference types. Structures are typically smaller and faster for simple data structures, but they are copied when passed as arguments, whereas classes are passed by reference. Classes support inheritance, while structures do not.

  2. Explain the concept of polymorphism in VB.NET. Provide an example.

    • Answer: Polymorphism allows objects of different classes to be treated as objects of a common type. This is achieved through inheritance and interfaces. For example, a `Shape` class can have derived classes like `Circle` and `Square`. A method like `CalculateArea()` can be defined in `Shape` and overridden in the derived classes, allowing you to call `CalculateArea()` on any `Shape` object regardless of its actual type.

  3. Describe different ways to handle exceptions in VB.NET.

    • Answer: VB.NET uses `Try...Catch...Finally` blocks to handle exceptions. The `Try` block contains code that might throw an exception. The `Catch` block specifies the type of exception to handle and the code to execute if that exception occurs. The `Finally` block contains code that always executes, regardless of whether an exception occurred, often used for cleanup.

  4. What are delegates and events in VB.NET? Give a practical example.

    • Answer: Delegates are type-safe function pointers. Events are a way to notify other parts of your application when something interesting happens. They use delegates to specify the signature of the event handler. A button click is a classic example: the button's `Click` event uses a delegate to point to a method that will be executed when the button is clicked.

  5. Explain the difference between `IEnumerable` and `IQueryable` in LINQ.

    • Answer: `IEnumerable` allows you to iterate through a collection, while `IQueryable` allows for deferred execution and translation of queries into a different data source (like a database). `IQueryable` offers more flexibility and performance optimizations for querying large datasets.

  6. How do you perform asynchronous programming in VB.NET? Discuss different approaches.

    • Answer: Asynchronous programming prevents blocking the UI thread. Common approaches include using `Async` and `Await` keywords (async/await pattern), `BackgroundWorker`, or Task Parallel Library (TPL).

  7. What are generics in VB.NET and why are they useful?

    • Answer: Generics allow you to write type-safe code that can work with different data types without losing type information at compile time. This improves code reusability and performance by avoiding boxing and unboxing.

  8. Explain the concept of reflection in VB.NET.

    • Answer: Reflection allows you to inspect and manipulate the metadata of types at runtime. This is useful for tasks like dynamic type loading, creating instances of types at runtime, and accessing properties and methods dynamically.

  9. Describe different ways to serialize and deserialize objects in VB.NET.

    • Answer: Common serialization methods include using the `BinaryFormatter`, `XmlSerializer`, `DataContractSerializer`, and `Json.NET` (a third-party library). Each has its strengths and weaknesses depending on the desired format and performance requirements.

Thank you for reading our blog post on 'VB.NET Interview Questions and Answers for 10 years experience'.We hope you found it informative and useful.Stay tuned for more insightful content!