private void btn_save_Click(object sender, EventArgs e) { int index_player1 = 0; int index_player2 = 0; for (int i = 0; i < numPicture; i++) { if (radioPlayer1[i].Checked) { index_player1 = i; } if (radioPlayer2[i].Checked) { index_player2 = i; } } if (index_player1 == index_player2) { MessageBox.Show("Error, should not same item."); } else { //string nameItem = "walker_"; //string nameItemSuper = "walker_super_"; //myBoardGame.setnamePictureItem(nameItem+index_player1,nameItemSuper+index_player1 // ,nameItem+index_player2,nameItemSuper+index_player2); myBoardGame.setIndexPictureItem(index_player1, index_player2); MessageBox.Show("Item is Changed."); } }