private void loadData() { if (cbMyPoint1.SelectedValue == null) { return; } int idMyPoint1; int.TryParse(cbMyPoint1.SelectedValue.ToString(), out idMyPoint1); MyPointList myPointList = MyPointList.getInstance(); MyPoint myPoint1 = myPointList.getItem(idMyPoint1); dgv.DataSource = _routeList.ToDataTable(myPoint1); if (dgv.Columns.Count > 0) { dgv.Columns[0].Visible = false; } }