Application pushing content to client browser [closed]

I am writing a console application in C#, I’ve written the web-server and now I would like to implement a feature where the application can push content to clients.

So far when a client connects to the application/web-server the client IP is added to a list of subscribers. The intention is that the console application will push content to the list of subscribers and if an ACK response is not received from each client then that client will be removed from the subscriber list.

The question is how do I push content to the clients?