private void FilterAudit_TextChanged(object sender, EventArgs e) { if (Location.SelectedItem == null) { return; } var temp = Model.GetAuditoriumIDPartial(FilterAudit.Text, (LocationInfo)Location.SelectedItem); if (temp != null) { Auditoriums.SelectTab(temp); } else { MessageBox.Show("Такой аудитории не существует"); } FilterAudit.Focus(); }