private void AddScreeningForm_Load(object sender, EventArgs e)
{
DateCalendar.MinDate = DateTime.Now;
this.ScreeningTaken.Visible = false;
movieComboBox.Items.AddRange(movieService.GetAllMovies().Select(m => m.Name + "," + m.ReleaseYear).ToArray());
auditoriumComboBox.Items.AddRange(auditoriumService.GetAudtitoriums(cinema.Id).Select(a => a.Number.ToString()).ToArray());
}