public TopicSet(int id) { InitializeComponent(); SectionTexbox.Text = id.ToString(); SectionTexbox.Enabled = false; Topics top = new Topics { ID = 0 }; topics = DependencyFacade.GetArrayTopics(LoginPanel.TeacherID); for (int i = 0; i < topics.Length; i++) { TopicCombobox.Items.Add(topics[i].Title); } TopicCombobox.DropDownStyle = ComboBoxStyle.DropDownList; TopicCombobox.SelectedIndex = 0; }