private void ListSoPhieu()
{
int IDDaiLy = int.Parse(ccbNhaCungCap.Value.ToString());
var KH = DBDataProvider.DB.khKhachHangs.Where(x => x.IDKhachHang == IDDaiLy).FirstOrDefault();
if (KH.LoaiKhachHangID == 3)
{
ckGiamCongNo.Checked = true;
}
ckGiamCongNo.Checked = false;
var ListGiaoHang = DBDataProvider.ListPhieuGiaoHang_TraHang(IDDaiLy);
ccbSoPhieu.DataSource = ListGiaoHang;
ccbSoPhieu.DataBind();
}