public void SimulateNewMail(string from, string to, string subject)
{
NewMailEventArgs e = new NewMailEventArgs(from, to, subject);
OnNewMail(e);
}
private void FaxMsg(object sender, NewMailEventArgs e)
{
Console.Write($"from={e.From},to={e.To},subject={e.Subject}");
}
protected virtual void OnNewMail(NewMailEventArgs e)
{
Volatile.Read(ref NewMail)?.Invoke(this, e);
}