private void p1_lbl1_DoubleClick(object sender, EventArgs e) { var lbl = (Label)sender; int.TryParse(lbl.Tag.ToString(), out var machineId); if (machineId == 0) { return; } var f = new Intervals(); f.SingleSelectedMachine = machineId; f.Size = new Size(1350, 700); f.ShowDialog(); f.Dispose(); }