static void Main(string[] args)
{
Ifactory operFactory = new AddFactory();
Operation oper = operFactory.CreateOperation();
oper.NumberA = 1;
oper.NumberB = 2;
double result = oper.GetResult();
}
static void Main(string[] args)
{
IFactory factory = new AddFactory();
Operation oper = factory.CreateOperation();
oper.NumberA = 1;
oper.NumberB = 2;
double result = oper.GetResult();
Console.WriteLine(result);
Console.ReadKey();
}