Пример #1
0
        private void ReturnGV_Click(object sender, EventArgs e)
        {
            this.Hide();
            ManHinhChinh manhinhchinh = new ManHinhChinh();

            manhinhchinh.ShowDialog();
        }
Пример #2
0
        private void btnDangnhap_Click(object sender, EventArgs e)
        {
            SqlConnection connection = new SqlConnection(@"Data Source=DESKTOP-C33GCG4;Initial Catalog=quanly_Hs_Gv_THPT_3F;Integrated Security=True");

            try
            {
                connection.Open();

                string taiKhoan = textBox1.Text;
                string matKhau  = textBox2.Text;
                string sql      = "select * from DANGNHAP where TaiKhoan = '" + taiKhoan + "' and MatKhau = '" + matKhau + "'";

                SqlCommand cmd = new SqlCommand(sql, connection);

                SqlDataReader dta = cmd.ExecuteReader();
                if (dta.Read() == true)
                {
                    this.Hide();
                    ManHinhChinh manHinhChinh = new ManHinhChinh();
                    manHinhChinh.ShowDialog();
                }
                else
                {
                    MessageBox.Show("Đăng nhập thất bại!");
                }
            }
            catch (Exception)
            {
                MessageBox.Show("Lỗi kết nối");
            }
        }