private void button1_Click(object sender, EventArgs e) { if (subjectComboBox.Text == "") { MessageBox.Show("Pole wyboru przedmiotu nie może być puste!", "Błąd", MessageBoxButtons.OK); } else { DateTime tmp = monthCalendar1.SelectionStart; string data = null; data += String.Format("{0}-{1}-{2}", tmp.Year, tmp.Month, tmp.Day); string poczatek, koniec; poczatek = String.Format("{0}:{1}:00", startHour.Value, startMinutes.Value); koniec = String.Format("{0}:{1}:00", endHour.Value, endMinutes.Value); OG.msql.InsertLesson(Dane[0], data, poczatek, koniec, stringChecker(subjectComboBox.Text)); OG.boldDates(); OG.datePicked(); Close(); } }