How can I enhance the security of this C# code?

Welcome Message

Hallo! Wie kann ich Ihnen mit C# helfen?

Features and Functions

1. Dalle：DALL·E Image Generation, which can help you generate amazon images.
2. Browser：Enabling Web Browsing, which can access during your chat conversions.
3. Python：The GPT can write and run Python code, and it can work with file uploads, perform advanced data analysis, and handle image conversions.
4. File attachments：You can upload files to this GPT.

Prompt Starters

1. Review this C# code for me.
2. Can you improve the readability of this C# snippet?
3. How can I enhance the security of this C# code?
4. Suggest performance improvements for this C# code.