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. The author has collected and structured the most common questions asked in IT company interviews when hiring C# and .NET specialists.

The book covers a wide range of topics — from basic language constructs to advanced aspects of the .NET platform. Each question is accompanied by a detailed yet concise answer with code examples and explanations. This allows you not just to memorize the correct answer, but to understand its essence.

Who is this book for?

• Junior developers — systematize their knowledge of C# and .NET, learn typical entry-level interview questions.
• Middle developers — deepen their understanding of key platform mechanisms and prepare for questions on architecture and performance.
• Senior developers — refresh complex topics in their memory and find answers to rare but important questions.
• Team leads and technical interviewers — can use the book as a checklist for creating questions for candidates.

What will you learn from the book?

• C# basics: data types, operators, control structures, strings, collections.
• Object-oriented programming: classes, inheritance, polymorphism, interfaces, abstract classes.
• Working with LINQ and Entity Framework: queries, deferred execution, optimization.
• Asynchronous programming: async/await, Task, CancellationToken, performance.
• Advanced topics: memory management, garbage collection, thread safety, design patterns.
• .NET architecture: CLR, JIT, assemblies, metadata, versioning.
• Testing and debugging: unit tests, mocking, profiling.

All questions are divided into thematic blocks, allowing you to study the material sequentially or select the sections you need. At the end of the book, there is a summary of the most difficult questions with an analysis of typical mistakes.

This book is not a syntax reference, but a concentrate of practical knowledge that will help you confidently pass the interview and get your dream offer. Regardless of your current level, you will find useful insights in it and be able to fill gaps in your understanding of C# and .NET.