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C# Security Basics

C# Security Practices

C# security ensures safe input handling with validation.

Understanding Input Validation in C#

Input validation is a fundamental aspect of C# security. It ensures that data received from users or external sources is clean, safe, and conforms to expected formats. Without proper validation, applications become vulnerable to attacks such as SQL injection, cross-site scripting (XSS), and other malicious exploits.

Using Regular Expressions for Validation

Regular expressions (regex) are powerful tools for pattern matching in strings. In C#, the System.Text.RegularExpressions namespace provides classes to work with regexes, enabling developers to validate input efficiently.

For example, to ensure an email address is valid, you can use the following code:

Handling SQL Injection

SQL injection is a common attack where an attacker can execute arbitrary SQL code on a database. To prevent this, always use parameterized queries or stored procedures. This approach ensures that user input is treated as data, not executable code.

Here's an example using parameterized queries with SqlCommand:

Cross-Site Scripting (XSS) Prevention

Cross-Site Scripting (XSS) involves injecting malicious scripts into web pages viewed by other users. To prevent XSS, encode all user input before rendering it on the page. This can be done using built-in HTML encoding methods.

Here's a simple example using ASP.NET:

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