private void AddRoom(object sender, RoutedEventArgs e)
        {
            var roomNumber = Number.Text;

            if (roomNumber.Length < 3)
            {
                MessageBox.Show($"You need to insert room number", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
            else
            {
                try
                {
                    var  campus = AuthenticationManager.GetCurrentCampus();
                    Room room   = new Room
                    {
                        Number   = roomNumber,
                        CampusId = campus.Id
                    };
                    RoomService.AddRoomToCampus(room);
                    MessageBox.Show($"Added room {room.Number} to {campus.Number} campus", "Information", MessageBoxButton.OK, MessageBoxImage.Information);
                    //mw.Owner = this;
                    this.Content = new AddRoomUserControl();
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"{ex.Message}", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                }
            }
        }