Platform Specifics

csharp.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading; //Had to add this.
using System.Threading.Tasks;

namespace ConsoleApplication1 {
  class Program {
    static void Main(string[] args) {

      Console.WriteLine("Started!");

      while (true) {
        String newData = Console.In.ReadLine();
        if (newData.ToLower() == "ping") {
          Console.WriteLine("pong");
        }
        Thread.Sleep(1); // Need to give other things a chance to go!
      }

    }
  }
}

node.js

var child_process = require('child_process');

//This is the path to the executable you want to talk to
var path = '../ConsoleClient/ConsoleApplication1/ConsoleApplication1/bin/Debug/ConsoleApplication1.exe';

var client = child_process.spawn(path,[]);

client.stderr.on('data', function(err){
  console.log(err.toString('utf8'));
});
client.stdout.on('data', function(data){
  console.log(data.toString('utf8'));
});

client.on('error', function(err){
  console.log(err);
});

client.stdin.write('ping\n');