How do I add a C# function on to my website?

How Can I add a C# function on to my website and connect it to PropCtrl?

Wix Studio

What are you trying to achieve:
I need to change the API to be compatible with PropCtrl (apparantly in C#) to enable me to feed my listings from PropCtrl to my website
What have you already tried:
[Share resources, forum topics, articles, or tutorials you’ve already used to try and answer your question.]

Additional information:
[Include any other pertinent details or information that might be helpful for people to know when trying to answer your question.]

There’s no ability to add C# code to any website. All websites use JavaScript.

If PropCtrl exposes an API you should be able to use what they provide to make queries and get the responses you want.