private void LoadAvailability()
        {
            // If
            if (comboBoxDates.SelectedIndex < 0 || comboBoxTimeSlots.SelectedIndex < 0)
            {
                return;
            }

            DateTime selectedDateTime = bookableDateTimes[comboBoxDates.SelectedIndex];
            string   selectedTimeSlot = comboBoxTimeSlots.Items[comboBoxTimeSlots.SelectedIndex].ToString();

            timeSlots = SqliteDataAccess.LoadTimeSlots(selectedDateTime.ToShortDateString(), selectedTimeSlot);

            foreach (Button button in reserveTimeSlotButtons)
            {
                button.Enabled = true;
            }

            foreach (TimeSlotModel timeSlotModel in timeSlots)
            {
                if (reserveTimeSlotButtons.ElementAtOrDefault(timeSlotModel.Roomid - 1) != null)
                {
                    MessageBox.Show(timeSlotModel.Booked.ToString());
                    reserveTimeSlotButtons[timeSlotModel.Roomid - 1].Enabled = false;
                }
            }
        }