Problem execution in silverlight application

Question

Hi,
I develop a module to delete a production order which is composed of a number of product (entry in the stock).
for that I have to delete the products that constitute the production order (delete entry and save as output) and record movement in the stock table => (in this case I have to recalculate the amount in stock qteStock = qteStock-qteEntree)
when I have a different product removal work properly. The problem arises when I have the same product that is several times the production order, the amount will be wrong in the stock.
foreach (var item in Entrees)
MonContext ctx = MonContext();
Sortie sortie = new Sortie();
sortie.IDArticle = item.IDArticle;
sortie.DateSortie = System.DateTime.Now;
sortie.QteUnitePrimaire = item.QteUnitePrimaire;
//add in table sortie
ctx.Sorties.Add(sortie);
ctx.SubmitChanges();
//add in table stock
Stock stock = new Stock();
stock.idEntreeSortie = sortie.IDSortie;
stock.DateEntreeSortie = DateTime.Now;
stock.IsSortie = true;
stock.IsEntree = false;
stock.IDArticle =item.IDArticle;
stock.qteStock= ctx.GetQuantiteInStock(item.IDArticle) - sortie.QteUnitePrimaire ;
ctx.Stocks.Add(stock);
ctx.SubmitChanges();
to recover the amount in stock in service class
public double? GetQuantiteInStock(int idArticle)
double? qteEntree = this.ObjectContext.Entree.Where(p => p.IDArticle == idArticle).Select(e => e.QteUnitePrimaire).Sum();
double? qteSortie = this.ObjectContext.Sortie.Where(p => p.IDArticle == idArticle).Select(e => e.QteUnitePrimaire).Sum();
return qteEntree-qteSortie;
So my problem is that when I execute my program and when I delete a production order
which contains ArticleID 40 2 times with the amount in the first entry is 3 and the second entry is 5 knowing that the initial amount in the stock is 20. I would have after the suppression of the production order when deleting the first input (qteStock
= 17) and after striking out the second input (qteStock = 15) then it must be recalculated part of 17 so it must be 12
according to my analysis to the execution I see that the program does not perform the operation requested for each item separately (ie it performs the addition output, calculating the qteStock and records in the Stock table before the first item go to the
second ..)
But it performs the addition in the output table for all then continues execution item
it is mainly a sequencing problem
I tried to use a BackgroundWorker to block the execution but without success, still the same problem (it skips the steps)
someone can propose ideas to get around this

Answer 1

The explanation lost me, I'm afraid.
I'm not sure that matters though.
You have to delete a couple of entries then get a total.
The call to
ObjectContext.SaveChanges();
Is on your web server and presumably called by some asynchronous web service ( because this is Silverlight ).
Even if it isn't Silverlight make it work this way anyhow.
Get the result back with a callback you provide when you make that call.
When you get that you can be confident the records are gone.
Then make your calculation call.
Hope that helps.
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