Applying security in methods, especially in APIs

Security is a paramount concern when designing methods, particularly in the context of APIs that may be exposed to external users. To enhance security, consider the following aspects.

Input validation

Always validate and sanitize input parameters to prevent security vulnerabilities such as injection attacks. Ensure that user input is validated and sanitized before it is processed by your method. Here’s an example:

public bool AuthenticateUser(string username, string password){
    if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password))
    {
        // Handle invalid input
        return false;
    }
    // Authenticate the user
    // ...
    return true;
}

Authentication and authorization

Implement robust...