C# Background Worker to process a List one by one

Question

I have a list of Contacts as follows.

List<string> Numbers = new List<string>();

This list can have any length of numbers in it. I want to send message to these numbers one by one and also report the progress to the user on a WinForm so I have a method like this.

private void ProcessBroadcast()
        {
            foreach (var number in Numbers)
                {
                    //Send a Message here
                    messageWorker.RunWorkerAsync(message);
                }
        } 

Since sending a message takes time so we opted to use BackgroundWorker to send a message. Now here the issue is we want to continue to send message to the next number in the foreach loop only when Background worker has completed.

I have implemented

messageWorker_DoWork

&

messageWorker_RunWorkerCompleted

and I am able to get the Number in messageWorker_RunWorkerCompleted method. I have done my research but couldn't find anything related to this.

Answer 1

    private void ProcessBroadcast()
    {
        //foreach (var number in Numbers)
        //{
        //    //Send a Message here
        //    messageWorker.RunWorkerAsync(message);
        //}
        messageWorker.EnableProgressReporting = true;
        messageWorker.RunWorkerAsync(Numbers);
    } 

The DoWork

// this runs on a background pool thread
void DoWork(object sender, args)
{
    var worker = sender as Backgroundworker;
    var Numbers = args.Argument as IEnumerable<SomeThing>;
    int percentage = 0;    

    foreach (var number in Numbers)
    {
        //Send a Message here
        worker.ReportProgress(percentage, number);

        // other processing on number, just don't use the UI
    }
}

Your Progress and Completed eventhandlers will be executed on the main thread.

(none of this was checked by a compiler)