private void movieComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            ClearScreeningsHolder();
            this._movieName = this.movieComboBox.SelectedItem.ToString();

            var screenings = ScreeningService.GetScreeningsByTownCinemaAndMovie(this._townName, this._cinemaName,
                                                                                this._movieName);

            this._screenings = screenings.ToList();

            RenderScreeningsHolder();
        }