How to determine when all task is completed

Question

here is sample code for starting multiple task

Task.Factory.StartNew(() =>
        {
            //foreach (KeyValuePair entry in dicLis         


        

Answer 1

if i start 10 task using Task.Factory.StartNew() so how do i notify after when 10 task will be finish

You can use Task.WaitAll. This call will block current thread until all tasks are finished.

Side note: you seem to be using Task, Parallel and Thread.SpinWait, which makes your code complex. I would spend a bit of time analysing if that complexity is really necessary.