static void OnAgeError(object sender, AgeChanged e)
{
Console.WriteLine("Error! Incorrect value of age: {0}", e.newAge);
Console.WriteLine(new string('=', 79));
}
static void OnAgeChanged(object sender, AgeChanged e)
{
Console.WriteLine("OnAgeChanged to {0}", e.newAge);
Console.WriteLine(new string('=', 79));
}