static void Main()
{
// Create a client
CalculatorClient client = new CalculatorClient();
Console.WriteLine("Press <ENTER> to terminate client once the output is displayed.");
Console.WriteLine();
// BeginAdd
double value1 = 100.00D;
double value2 = 15.99D;
IAsyncResult arAdd = client.BeginAdd(value1, value2, AddCallback, client);
Console.WriteLine("Add({0},{1})", value1, value2);
// BeginSubstract
value1 = 145.00D;
value2 = 76.54D;
IAsyncResult arSubtract = client.BeginSubtract(value1, value2, SubtractCallback, client);
Console.WriteLine("Subtract({0},{1})", value1, value2);
// BeginMultiply
value1 = 9.00D;
value2 = 81.25D;
IAsyncResult arMultiply = client.BeginMultiply(value1, value2, MultiplyCallback, client);
Console.WriteLine("Multiply({0},{1})", value1, value2);
// BeginDivide
value1 = 22.00D;
value2 = 7.00D;
IAsyncResult arDivide = client.BeginDivide(value1, value2, DivideCallback, client);
Console.WriteLine("Divide({0},{1})", value1, value2);
Console.ReadLine();
//Closing the client gracefully closes the connection and cleans up resources
client.Close();
}