C# Interview Questions
I have collected C# interview questions and answers for fresh developers, senior developers, and mid-level developers.
C# Interview questions for Beginners
Question: What is polymorphism in c#
Answer: Polymorphism in c#
Question: what is boxing & unboxing in c#?
Answer: Boxing & Unboxing in C#
Question: what is the SOLID principle in C#
Answer: SOLID is a set of principles that guide software development and design, aimed at producing code that is more modular, flexible, and maintainable. The acronym SOLID stands for:
- S – Single Responsibility Principle (SRP)
- O – Open/Closed Principle (OCP)
- L – Liskov Substitution Principle (LSP)
- I – Interface Segregation Principle (ISP)
- D – Dependency Inversion Principle (DIP)
Here’s a brief overview of each principle:
- Single Responsibility Principle (SRP): A class should have only one reason to change. In other words, a class should have only one responsibility or job to do. This principle promotes the idea of creating smaller, more focused classes that are easier to test, maintain, and extend.
- Open/Closed Principle (OCP): A class should be open for extension but closed for modification. This principle encourages developers to design their classes in a way that allows them to add new functionality without modifying the existing code. This can be achieved by using inheritance, composition, or other design patterns.
- Liskov Substitution Principle (LSP): Subtypes should be substitutable for their base types. This principle ensures that a subclass can be used in place of its parent class without any unexpected behavior. In other words, a subclass should adhere to the same contract as its parent class.
- Interface Segregation Principle (ISP): A client should not be forced to depend on interfaces it does not use. This principle encourages developers to create smaller, more specific interfaces that are tailored to the needs of the client. This helps to avoid unnecessary dependencies and makes the code more modular.
- Dependency Inversion Principle (DIP): High-level modules should not depend on low-level modules. Both should depend on abstractions. This principle promotes the use of interfaces and abstractions to reduce coupling between components. It encourages the use of dependency injection, which allows components to be easily replaced or modified without affecting the rest of the system.
By following the SOLID principles, developers can create code that is easier to understand, test, and maintain. The SOLID principles promote modularity, flexibility, and extensibility, which are important qualities for any software system.