// *************************************************************
private void btnRoomLoadGrid_Click(object sender, RoutedEventArgs e)
{
service.RoomService roomService = new service.RoomService();
this.DataContext = roomService.GetAllRooms();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
service.RoomService roomService = new service.RoomService();
this.DataContext = roomService.GetAllRooms();
}