private void btnThem_Click(object sender, EventArgs e) { TheLoai theLoai = new TheLoai(); theLoai.MaTLoai = txtMa.Text; theLoai.TenTLoai = txtTen.Text; theLoai.GhiChu = txtGhiChu.Text; TheLoaiBUS theLoaiBUS = new TheLoaiBUS(); if (theLoaiBUS.themTheLoai(theLoai)) { MessageBox.Show("Thêm OK !"); loadData(); } else { MessageBox.Show("Thêm lỗi !"); return; } }