private void BtnTurnOff_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
_server.Broadcast(new SocketPackage()
{
Action = SocketPackage.EnumAction.ServerShutdown
});
_server.Stop();
btnTurnOn.IsEnabled = true;
btnTurnOff.IsEnabled = false;
ShowInformation();
ShowMessage("turn off server");
}
