public void AddReturningBill(string billId, string proId, int feeToCus)
{
string now = DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");
string lastChangingBillId = dal.GetLastReturningBillId().Rows.Count == 0 ? "" : dal.GetLastReturningBillId().Rows[0][0].ToString();
dal.AddReturningBill(AddBillBLL.NextId("HDT", lastChangingBillId, 3), now, GetCustomerId(billId), "NV1", billId, proId, feeToCus);
}
public void SaveBill(string cusId, string staffId, int sum, List <BillProduct> proList)
{
string now = DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");
string lastBillId = dal.GetLastBillId().Rows.Count == 0?"":dal.GetLastBillId().Rows[0][0].ToString();
dal.AddBill(AddBillBLL.NextId("HD", lastBillId, 2), now, cusId, staffId, sum, proList);
}