partial void Sale_Details_Updating(Sale_Detail entity)
{
var value = (from val in Sales
where val.Sale_ID.Equals(entity.Sale.Sale_ID)
select val).FirstOrDefault();
value.Total = 0;
entity.Sale = calculateTotal(value); //if sale detail value is changed then
//recount total and update it.
}
partial void Sale_Details_Inserted(Sale_Detail entity)
{
entity.Product.Stock_In_hand -= entity.Quantity;
// subtracting the stock issued.
}
