How create server?

[khusamov]

How create server on C#?

const { Server } = require("socket.io");
const io = new Server();

Project socket.io implies the creation of both a server and a client. And the project for C# is only a client. The question is, how to create a server? On the Node.js create a server? And why, if we have a wonderful C# language? Why not make a server on it?