private void btnThemMon_Click(object sender, EventArgs e)
{
if (txtSoLuong.Text == "")
{
MessageBox.Show("Vui lòng nhập số lượng!");
}
//Them mon vao cthd
CTHD_DTO cthd = new CTHD_DTO(int.Parse(lbMHD.Text), lbMon.Text, float.Parse(lbDonGia.Text), int.Parse(txtSoLuong.Text));
bool kq = CTHD_BUS.ThemCTHD(cthd);
if (kq == false)
{
MessageBox.Show("loi!");
}
else
{
dataGridView3.DataSource = CTHD_BUS.LoadCTHDTheoMHD(int.Parse(lbMHD.Text));
}
//hien thi ds
//cap nhat tong tien
float tongtien = 0;
int dong = dataGridView3.RowCount;
for (int i = 0; i < dong; i++)
{
tongtien += float.Parse(dataGridView3.Rows[i].Cells[1].Value.ToString()) * float.Parse(dataGridView3.Rows[i].Cells[2].Value.ToString());
}
txtTongTien.Text = tongtien.ToString();
}