How to use multithreading with Winform?

Question

I\'m a newbie with multithreading. I have a winform that have a label and a progress bar.

I wanna show the processing result. Firstly, I use Application.DoEven

Answer 1

There are some fundamental problems with the code you have shown. As other have mentioned, Application.DoEvents() will not do what you want from a background thread. Separate your slow background processing into a BackgroundWorker and update your progress bar in the UI thread. You are calling progressBar1.Value++ from a background thread, which is wrong.

Never call Control.CheckForIllegalCrossThreadCalls = false, that will only hide errors.

If you want to update a progress bar from a background thread, you will have to implement a ProgressChanged handler; you are not doing that.

If you need an example of implementing a BackgroundWorker, consult the article BackgroundWorker Threads from Code Project.