What is abstraction with regards to .NET?

Interviewers ask about abstraction in .NET to gauge your understanding of key programming concepts that are crucial for building efficient software. This question assesses your technical knowledge, especially regarding object-oriented programming principles, and how you apply them in practice. They may also be looking for your ability to explain complex topics in a clear manner, which indicates your communication skills.

Begin by defining abstraction in the context of .NET, such as, 'Abstraction in .NET refers to the principle of hiding the complex implementation details of a system and exposing only the necessary parts to the user. This is typically achieved through abstract classes and interfaces.' Follow this with a concrete example: 'For instance, in a banking application, I could create an abstract class called Account, which might define the methods Deposit and Withdraw, but the details of how these methods work would vary by subclasses such as SavingsAccount and CheckingAccount.' Highlight how this enhances code maintainability and readability.