private void btnAddMusic_Click(object sender, EventArgs e) { if (txtMusicName.Text != "" && txtSinger.Text != "" && cmBxType.Text != "" && txtMusicPrice.Text != "") { GrpBxBook.Visible = false; GrpBxMusic.Visible = true; MusicCD music = new MusicCD(); music.name = txtMusicName.Text; music.Singer = txtSinger.Text; music.price = int.Parse(txtMusicPrice.Text); music.Type = cmBxType.Text; music.InsertMusic(music); music.printProperties(dataGridView1); } else { MessageBox.Show("Please fill in the blank fields", "Warning !", MessageBoxButtons.OK, MessageBoxIcon.Warning); } }