// The Facade's methods are convenient shortcuts to the sophisticated
// functionality of the subsystems. However, clients get only to a
// fraction of a subsystem's capabilities.
public string Operation()
{
string result = "Facade initializes subsystems:\n";
result += _subsystem1.Operation1();
result += _subsystem2.Operation1();
result += "Facade orders subsystems to perform the action:\n";
result += _subsystem1.OperationN();
result += _subsystem2.OperationZ();
return(result);
}
