C# (.NET) Interview: 200 Questions and Answers

The book "C# (.NET) Interview: 200 Questions and Answers" is a practical guide for developers preparing for a technical interview at any company level. The author has compiled the most frequently asked questions in interviews for the C# language and .NET platform, ranging from basic topics to deep architectural and low-level aspects.

The book covers the following key sections:

• C# Basics: data types, classes, structs, interfaces, inheritance, polymorphism, encapsulation.
• Advanced Language Features: generics, delegates, events, lambda expressions, LINQ, async/await, threads and parallelism.
• .NET Platform: CLR, JIT compilation, Garbage Collection (GC), memory management, Assemblies, GAC, versioning.
• Design Patterns: Singleton, Factory, Repository, Unit of Work, Dependency Injection, SOLID, DRY, KISS, YAGNI.
• Data Access: ADO.NET, Entity Framework, Dapper, transactions, N+1 problem, migrations.
• Testing and Debugging: Unit tests, Mock objects, TDD, integration testing, profiling.
• Architecture and Practices: REST, ASP.NET Core, Middleware, Web API, security, logging, CI/CD.
• Real-world Cases and Problems: logic questions, code optimization, refactoring, analysis of common interview mistakes.

The book is intended for:

• Junior developers who want to systematize their knowledge and confidently pass their first interview.
• Middle developers looking to deepen their understanding of the platform and prepare for Senior-level positions.
• Team Leads who conduct interviews and want to have reference answers at hand.

Each question is accompanied not only by the correct answer but also by explanations, code examples, common pitfalls, and recommendations on how to answer best to impress the interviewer. At the end of the book, you will find a list of additional resources and a self-assessment checklist for pre-interview preparation.

This book is your reliable assistant in preparing for a technical interview in C# and .NET. With it, you can systematize your knowledge, fill in gaps, and confidently answer any employer's questions.