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C# Security: Best Practices for Secure Coding

C# Security: Best Practices for Secure Coding


 C# is a widely used programming language that is known for its ease of use and versatility. However, with the increasing number of cyber-attacks and security breaches, it is essential to ensure that the code we write in C# is secure. In this article, we will discuss some of the best practices for secure coding in C#.

Avoid Using Plain Text Passwords

When working with passwords, it is essential to store them securely. Storing passwords in plain text is a significant security vulnerability, and it is essential to avoid doing so. Instead, use a secure password hashing algorithm such as PBKDF2 or bcrypt to store the password.

Input Validation

Input validation is crucial when working with user input, as it helps prevent injection attacks such as SQL injection and cross-site scripting. Always validate user input and use parameterized queries when working with databases.

Use Parameterized SQL Queries

As mentioned earlier, parameterized queries are a powerful way to prevent SQL injection attacks. Instead of directly concatenating user input into an SQL query, use parameterized queries to pass input values as parameters.

Use Cryptography

When working with sensitive data, it is essential to use cryptography to protect it. Use standard cryptographic functions and algorithms such as AES, RSA, and SHA to encrypt and hash data.


When working with web applications, it is crucial to use HTTPS to protect user data in transit. Always use HTTPS instead of HTTP, especially when working with sensitive data such as passwords, credit card numbers, or personal information.

Don't Hardcode Secrets

Avoid hardcoding secrets such as API keys and passwords in your code. Instead, use a secure secret storage mechanism such as the Windows Credential Manager or environment variables to store secrets.

Keep Your Code Up To Date

It is essential to keep your code up to date with the latest security patches and updates. Always stay informed about the latest security vulnerabilities and patches and update your code accordingly.


Writing secure code is crucial when working with C# applications. By following these best practices, you can ensure that your code is more secure and less vulnerable to attacks. Remember, security should always be a top priority, and it is essential to stay informed and up to date with the latest security practices and vulnerabilities.  Do not forget that this article is an overview of what I am currently writing for C# Corner.


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