public ReservationForm() { InitializeComponent(); _ReservationLogic = new ReservationLogic(); _ReservationLogic.CreateDB(); dd_arrivingHour.Text = "21"; dd_arrivingMinute.Text = "00"; // Adds 0 till 23 hours to the combobox with the reservation time for (int i = 0; i <= 23; i++) { if (i < 10) { dd_arrivingHour.Items.Add("0" + i); } else { dd_arrivingHour.Items.Add(i); } } for (int i = 0; i < 60; i += 15) { if (i == 0) { dd_arrivingMinute.Items.Add("00"); } else { dd_arrivingMinute.Items.Add(i); } } }