- Preface i
-
1 The .NET Version History 1
- 1.1 .NET Framework 1.0 | C# 1.0 | Visual Studio 2002 | 2002 1
- 1.2 .NET Framework 1.1 | C# 1.1 | Visual Studio 2003 | 2003 3
- 1.3 .NET Framework 2.0 | C# 2.0 | Visual Studio 2005 | 2005 4
- 1.4 .NET Framework 3.0 | C# 2.0 | Visual Studio 2005 | 2006 6
- 1.5 .NET Framework 3.5 | C# 3.0 | Visual Studio 2008 | 2007 6
- 1.6 .NET Framework 4.0 | C# 4.0 | Visual Studio 2010 | 2010 7
- 1.7 .NET Framework 4.5 | C# 5.0 | Visual Studio 2012 | 2012 9
- 1.8 .NET Framework 4.6 | C# 6.0 | Visual Studio 2015 | 2015 10
- 1.9 .NET Framework 4.7 | C# 7.0 - 7.3 | Visual Studio 2017 | 2017 11
- 1.10 .NET Framework 4.8 | C# 7.3 | Visual Studio 2019 | 2019 14
- 1.11 .NET Core 1.0 | C# 6.0 | Visual Studio 2015 | 2016 14
- 1.12 .NET Core 2.0 | C# 7.0 | Visual Studio 2017 | 2017 14
- 1.13 .NET Core 3.0 | C# 8.0 | Visual Studio 2019 | 2019 15
- 1.14 .NET Core 3.1 (LTS) | C# 8.0 | Visual Studio 2019 | 2019 16
- 1.15 .NET 5 | C# 9.0 | Visual Studio 2019 | 2020 16
- 1.16 .NET 6 (LTS) | C# 10.0 | Visual Studio 2022 | 2021 17
- 1.17 .NET 7 | C# 11.0 | Visual Studio 2022 | 2022 18
- 1.18 .NET 8 | C# 12.0 | Visual Studio 2022 | 2023 20
- 1.19 .NET 9 | C# 13.0 | Visual Studio 2023 | 2024 21
- 1.20 .NET 10 (LTS) | C# 14.0 | Visual Studio 2025 | 2025 22
-
2 Data Structures 24
- 2.1 Arrays in .NET 24
- 2.2 Lists in .NET 30
- 2.3 Dictionaries in .NET 35
- 2.4 Stacks in .NET 42
- 2.5 Queues in .NET 48
- 2.6 HashTables and HashSets in .NET 56
- 2.7 Trees in .NET 68
- 2.8 Graphs in .NET 76
-
3 Algorithms 96
- 3.1 Sorting Algorithms in .NET 96
- 3.2 Search Algorithms in .NET 108
- 3.3 Graph Algorithms in .NET 124
- 3.4 Dynamic Programming in .NET 144
-
4 C# Fundamentals 151
- 4.1 C# Basics 151
- 4.2 Delegates and Parameters 162
- 4.3 Value Types, Reference Types, Immutable, Semantics 170
- 4.4 Types and Type Differences 178
- 4.5 Collections and LINQ 187
-
5 OOP Design and Best Practices 199
- 5.1 Object-Oriented Programming (OOP) 199
- 5.2 SOLID Principles 210
- 5.3 DRY (Don’t Repeat Yourself) 213
- 5.4 Clean Code and Best Practices 214
- 5.5 Incremental Refactor and Code Update Techniques 226
-
6 Design Patterns 237
- 6.1 Creational Patterns 238
- 6.2 Structural Patterns 242
- 6.3 Behavioral Patterns 250
-
7 Memory Management and Performance 266
- 7.1 Stack and Heap Memory 266
- 7.2 Garbage Collection 270
- 7.3 Performance and Optimization 275
-
8 Databases, TSQL and ORMs 280
- 8.1 SQL Server Basics, Schemas, Tables, Views, Jobs, SSRS, SSIS, and System Databases 280
- 8.2 T-SQL (Transact-SQL), Stored Procedures (SProcs), Views, Functions, etc 288
- 8.3 ORM Concepts and Entity Framework 295
- 8.4 LINQ to Entities 302
- 8.5 Advanced Topics in Entity Framework and LINQ 310
-
9 Advanced C# Concepts 317
- 9.1 Advanced C# Language Features 317
- 9.2 Compilation, Managed vs. Unmanaged Code, Intermediate Language (IL), CLR 342
- 9.3 Reflection and Dynamic Code 350
- 9.4 New Features and Enhancements in .NET 358
-
10 System Design and Architecture 367
- 10.1 Low-Level and High-Level System Design 367
- 10.2 Non-Functional Requirements System Design 377
- 10.3 Systems Architecture, Components, Modules, and Layers 385
- 10.4 Architectural Patterns and Message Queues 397
- 10.5 System Architecture: Layered Modular Design with Data, Service, Core, UI, and Common Code Layers 408
-
11 Concurrency and Multithreading 419
- 11.1 Concurrency and Multithreading Basics 419
- 11.2 Thread Management 428
- 11.3 Asynchronous Programming 436
- 11.4 Synchronization Primitives 443
- 11.5 Advanced Concurrency and Multithreading 452
-
12 Testing and Automation 460
- 12.1 .NET Unit Testing, Techniques, Patterns, and Best Practices 460
- 12.2 Practical Unit Test Examples, Code Coverage, and Tools 472
- 12.3 Advanced Test Automation and CI/CD 484
-
13 Web APIs in .NET 492
- 13.1 Web API REST Service Design With .NET Core 492
- 13.2 ASP.NET Web API Routing, Endpoints, Controllers, DI, Model Binding, Validations, and Versioning 500
- 13.3 Caching and Performance in REST Services 510
- 13.4 Web API REST Principles in .NET Core 518
- 13.5 Web API Security, JWT, JSON Tokens, and Authentication 526
- 13.6 ASP.NET Core Web API Middleware 534
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14 Cloud Infrastructure and DevOps 545
- 14.1 Cloud Computing with Azure and Azure Services 545
- 14.2 Docker and Virtual Machines (Azure, GitLab) 555
- 14.3 Azure Functions 563
- 14.4 CI/CD, Builds, and Pipelines for .NET Apps (Azure, GitLab) 572
-
15 Security in .NET Applications 585
- 15.1 General Code Security and Best Practices in .NET 585
- 15.2 Obfuscation, Data Protection, Authentication, and Authorization 593
- 15.3 Network Security, Preventing Common Security Vulnerabilities 601
The C# and .NET Interview Compendium – Second Edition
Interview Questions and Answers for C# and .NET Developers
A practical, modern interview-preparation compendium for C# and .NET developers (615 manuscript pages).
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The C# and .NET Interview Compendium – Second Edition
Interview Questions and Answers for C# and .NET Developers
This book is a comprehensive collection of questions and answers designed to help software developers prepare for technical interviews focused on C# and the .NET ecosystem.
The content is organized into structured chapters that cover the core concepts developers are expected to understand when working with modern .NET applications. Each section provides concise explanations and practical examples to reinforce key ideas and common interview topics.
The second edition has been updated and expanded to reflect modern development practices and the latest versions of the .NET platform, including updates relevant to .NET 10.
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Yohan Rodriguez
Yohan is a Senior Full-Stack Software Engineer with extensive experience delivering scalable, end-to-end software solutions across web, enterprise, and cloud-based environments. He specializes in architecting robust platforms, modernizing legacy systems, driving cloud transformation efforts, and building integration-heavy applications that support critical business workflows. He is recognized for translating complex requirements into reliable, maintainable, and high-value solutions across industries such as insurance, cybersecurity, and professional services.
Known for combining strong technical execution with a practical business mindset, he has contributed to projects from concept and design through production delivery and long-term support. His experience includes collaborating with cross-functional teams, improving development workflows, solving complex technical challenges, and helping organizations deliver dependable software products that adapt to changing business needs. He brings a balanced approach to engineering that values quality, efficiency, and continuous improvement.
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