Basic WCF Call + Callback example

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ClientApp
{
    public class Callback : ClientApp.ServiceReference1.ICalculatorCallback
    {
        Form1 parent;
        public void MakeACallback(int callbacksMade)
        {
            parent.richTextBox1.Text += "\nCallback #" + callbacksMade;
        }
        public Callback(Form1 parent)
        {
            this.parent = parent;
        }
    }
}