How can C# be utilized to seamlessly integrate artificial intelligence algorithms into a web-based platform, optimizing user experience and enhancing system performance?

In the realm of software development, particularly in web-based applications, there's a growing demand for intelligent systems that adapt to user behavior and optimize performance. Considering the versatility of C# in various domains, how can developers harness its capabilities to seamlessly integrate cutting-edge artificial intelligence algorithms, such as machine learning models for predictive analytics or natural language processing for enhanced user interaction, into a web-based platform? Furthermore, what specific C# libraries, frameworks, or methodologies would you recommend for effectively implementing these AI features while ensuring scalability, security, and maintainability of the system?