static void Main(string[] args)
{
InstanceContext instanceContext = new InstanceContext(new CalculatorCallBack());
CalculatorClient client = new CalculatorClient(instanceContext);
client.AddTo(100.00D);
client.SubtractTo(50.0D);
client.MultipleTo(17.0D);
client.DivideTo(2.0D);
client.Clear();
Console.WriteLine("Press <Enter> to close");
Console.ReadLine();
client.Close();
}