private void GameField_CheckedChanged(object sender, EventArgs e) { System.Windows.Forms.CheckBox box = (System.Windows.Forms.CheckBox)sender; int.TryParse(box.Name, out int Num); if (boatPlacer.Place(this, (int)(Num / 10), Num % 10)) { parentForm.BoatPlacerControl(boatPlacer.GetLength()); boatPlacer.SetLength(0); } UpdateCheckBoxes(); }