C# (.NET) Application Security: Protecting Code from Attacks

In the modern world, developing secure software is not just a requirement, but a necessity. The book "C# (.NET) Application Security" is a practical guide that will help you protect your .NET applications from the most common and dangerous attacks. The author, Alexey Petrov, an experienced developer and information security specialist, shares proven methods and techniques that can be immediately applied in practice.

What is this book about?

This book covers all key aspects of security when developing in C# for the .NET platform (including .NET Core and .NET 5+). You will not just learn theory — you will get specific code examples that help you understand how vulnerabilities work and how to fix them. The main topics of the book:

• Protection against SQL injections: using parameterized queries and Entity Framework to prevent malicious code from being injected into the database.
• Web application security: protection against XSS (Cross-Site Scripting), CSRF (Cross-Site Request Forgery), and Clickjacking.
• Authentication and authorization management: implementing secure login mechanisms, working with JWT tokens, OAuth 2.0, and ASP.NET Core Identity.
• Data protection: encryption, password hashing, secure storage of secrets (Connection Strings, API keys).
• Code security: preventing buffer overflows, memory leaks, and race conditions in multithreaded applications.
• Working with vulnerabilities: analyzing typical errors in .NET projects, using static analyzers (Roslyn, SonarQube).

Who is this book for?

The book will be useful both for beginner C# developers who want to write secure code from the very first steps, and for experienced programmers seeking to deepen their knowledge in application protection. If you work with ASP.NET, WPF, Xamarin, or Unity — you will find relevant advice for your platform here.

What will you learn?

• How to analyze code for vulnerabilities using built-in Visual Studio tools.
• How to properly configure HTTPS, HSTS, and CSP in ASP.NET Core.
• How to protect an API from man-in-the-middle attacks and password brute-forcing.
• How to write unit tests to verify the security of your code.
• How to update dependencies and avoid using outdated libraries with known CVEs.

The book is written in simple and accessible language, with a large number of code listings and explanations. Each chapter ends with a practical task to reinforce the material. This is not just theory — it is a tool that will make your applications reliable and resistant to attacks.

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