private async void frmResourceFinder_Load(object sender, EventArgs e) { Areas = new AreasKeeper(); await Areas.Refresh(); cmbArea.DataSource = Areas.Items; cmbArea.ValueMember = "AreaId"; cmbArea.DisplayMember = "Name"; Sets = new SetsKeeper(); await Sets.Refresh(); Places = new PlacesKeeper(); await Places.Refresh(null, 'a'); }