private void cbVeThang_SelectedIndexChanged(object sender, EventArgs e)
{
DateTime now = DateTime.Now;
string months = blKhachHang.GetDetailOfTicket(cbVeThang.GetItemText(cbVeThang.SelectedItem)).Tables[0].Rows[0][8].ToString(); ////
float price = float.Parse(blKhachHang.GetDetailOfTicket(cbVeThang.GetItemText(cbVeThang.SelectedItem)).Tables[0].Rows[0][2].ToString());
int uudai = int.Parse(blKhachHang.GetDetailOfTicket(cbVeThang.GetItemText(cbVeThang.SelectedItem)).Tables[0].Rows[0][6].ToString()); //LỖI
SHAREVAR.PriceOfRegister = price - price * uudai / 100;
//txtNgayHetHan.Text = now.AddMonths(Int32.Parse(months)).ToString();
if (Giahan == false)
{
dateTimePickerHetHan.Text = now.AddMonths(Int32.Parse(months)).ToString();
}
else
{
int r = dgvQLKhachHang.CurrentCell.RowIndex;
dateTimePickerHetHan.Text = dgvQLKhachHang.Rows[r].Cells[7].Value.ToString();
dateTimePickerHetHan.Text = Convert.ToDateTime(dateTimePickerHetHan.Text).AddMonths(Int32.Parse(months)).ToString();
}
}