private async void btn_create_Click(object sender, RoutedEventArgs e)
        {
            FormCreateRoom form = new FormCreateRoom();

            form.ShowDialog();

            if (form.status)
            {
                RoomRequest request = new RoomRequest();

                request.outlet_id = Int32.Parse(outletid);
                request.room_name = form.Get_Roomname();
                request.max_beds  = form.Get_maxbed();
                request.r_type    = form.Get_RoomTypeID();

                progress_bar.Visibility = Visibility.Visible;
                bool result = await RestAPI.CreateRoom(request);

                progress_bar.Visibility = Visibility.Collapsed;

                if (result)
                {
                    if (send != null)
                    {
                        send.Invoke(outletid);
                    }

                    MessageBox.Show("Create Room Successful");
                }
                else
                {
                    MessageBox.Show("Create Room Fail");
                }
            }
        }