This demo provides a dialogue that you can display modally over another form while that form does some background work. You basically write a normal DoWork event handler for a BackgroundWorker, as well as optional ProgresssChanged and RunWorkerCompleted event handlers, and pass them to the dialogue for it to use as handlers for the events of its own BackgroundWorker. That means that your form creates and displays the dialogue, the dialogue then kicks off a BackgroundWorker and it invokes methods in your form to do the work. That way, this same dialogue can be used for any work you like without change.
The dialogue displays a Marquee ProgressBar by default and no Cancel button. If you provide a handler for the ProgressChanged event, it will display a Continuous ProgressBar so the actual progress can be displayed. Note that the Maximum of that ProgressBar is 100 so you must provide a genuine percentage when you call ReportProgress. If you set SupportsCancellation to True, the dialogue will also display a Cancel button. As always, it's up to you to process the cancellation request in your DoWork event handler.
This attached solution was created in VS 2019 and targets .NET Framework 4.8. It contains both C# and VB version of the demo. If you're using an earlier version, you should still just be able to add the forms as existing items to a project of your own, as long as you're not using too-old a version.
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