Sockets in .NET - Getting started with a multithreaded server

Question

Networking in C# is something I am relatively new to and so I was wondering how to get started with it for a particular project.

Ultimately, I want to develop a server which can have as many as one thousand clients connected to it concurrently (TCP protocol).

I understand creating a new thread for each client would be potentially quite inefficient, especially with the memory overhead of each thread once passing 100 clients for example.

So simply, what I am asking is, could anyone suggest anywhere I could find out more about getting started with developing 'multithreaded' servers for many clients.

(Please add a comment if this question is too broad.)

Answer 1

You may give a try for SignalR for sockets.

What is SignalR?
ASP.NET SignalR is a library for ASP.NET developers that simplifies the process of adding real-time web functionality to applications. Real-time web functionality is the ability to have server code push content to connected clients instantly as it becomes available, rather than having the server wait for a client to request new data.
...
SignalR provides a simple API for creating server-to-client remote procedure calls (RPC) that call JavaScript functions in client browsers (and other client platforms) from server-side .NET code. SignalR also includes API for connection management (for instance, connect and disconnect events), and grouping connections.

To implement a server you need to derive from Hub class:

using System;
using System.Web;
using Microsoft.AspNet.SignalR;
namespace SignalRChat
{
    public class ChatHub : Hub
    {
        public void Send(string name, string message)
        {
            // Call the broadcastMessage method to update clients.
            Clients.All.broadcastMessage(name, message);
        }
    }
}

And from client side javascript is like this:

var chat = $.connection.chatHub;
chat.client.broadcastMessage = function (name, message) {
  // interact with server
}
$.connection.hub.start().done(function () {
    $('#sendmessage').click(function () {
        // Call the Send method on the hub. 
        chat.server.send($('#displayname').val(), $('#message').val());
        // Clear text box and reset focus for next comment. 
        $('#message').val('').focus();
    });
});

Supported Platforms for SignalR are:

• Server side
  • Windows Server 2012
  • Windows Server 2008 r2
  • Windows 8
  • Windows 7
  • Windows Azure
• Client side
  • Browsers
  • Microsoft Internet Explorer versions 8, 9, 10, and 11. Modern, Desktop, and Mobile versions are supported.
  • Mozilla Firefox: current version - 1, both Windows and Mac versions.
  • Google Chrome: current version - 1, both Windows and Mac versions.
  • Safari: current version - 1, both Mac and iOS versions.
  • Opera: current version - 1, Windows only.
  • Android browser
  • Windows Desktop and Silverlight Applications
  • Applications using .NET 4 are supported on Windows XP SP3 or later.
  • Applications using .NET Framework 4.5 are supported on Windows Vista or later.
  • Windows Store and Windows Phone 8 Applications

Default performance constants do cover your limitations for up to 1000 simultaneous requests.