private void btnOK_Click(object sender, EventArgs e) { TaiKhoan_DTO tk = new TaiKhoan_DTO(); tk.PassWord = tbxMKOld.Text; tk.Username = tbxMaNV.Text; tk.newPassWord = tbxMKNew.Text; Results re = new Results(); re = TaiKhoan_BUS.Change_Pass(tk); if (re.TK_result == 1) { MessageBox.Show(re.TK_Message); } else { MessageBox.Show(re.TK_Message); } }