private void btnLapPhieuMoi_Click(object sender, EventArgs e)
{
i = 0;
Tien = 0;
txtTongtien.Text = "0";
btnLapPhieuMoi.Enabled = false;
btnThemSP.Enabled = true;
cboNCC.Enabled = false;
btnIn.Enabled = true;
txtSoPĐ.Text = DonDatHangBUS.GetIDPhieuDat();
txtMaSP.ResetText();
txtTenSP.ResetText();
txtSoLuong.ResetText();
txtGia.ResetText();
dtkNgayDat.Value = DateTime.Now;
dgvDanhSach.Rows.Clear();
// Thêm vào auto complete.
AutoCompleteStringCollection auto = new AutoCompleteStringCollection();
foreach (DataRow row in SanPhamBUS.DanhSachSPTheoNCC(cboNCC.SelectedValue.ToString()).Rows)
{
auto.Add(row["MaSanPham"].ToString());
}
txtMaSP.AutoCompleteMode = AutoCompleteMode.Suggest;
txtMaSP.AutoCompleteSource = AutoCompleteSource.CustomSource;
txtMaSP.AutoCompleteCustomSource = auto;
}