Task.WaitAll and Exceptions

Question

I have a problem with exception handling and parallel tasks.

The code shown below starts 2 tasks and waits for them to finish. My problem is, that in case a task thr

Answer 1

I was trying to create a call for each item in a collection, which turned out something like this:

var parent = Task.Factory.StartNew(() => {
  foreach (var acct in AccountList)
    {
      var currAcctNo = acct.Number;
      Task.Factory.StartNew(() =>
      {
        MyLocalList.AddRange(ProcessThisAccount(currAcctNo));
      }, TaskCreationOptions.AttachedToParent);
      Thread.Sleep(50);
    }
  });

I had to add the Thread.Sleep after each addition of a child task because if I didn't, the process would tend to overwrite the currAcctNo with the next iteration. I would have 3 or 4 distinct account numbers in my list, and when it processed each, the ProcessThisAccount call would show the last account number for all calls. Once I put the Sleep in, the process works great.