Question

I get this error if I click a button that starts the backgroundworker twice.

This BackgroundWorker is currently busy and cannot run multiple tasks concurrently 

How can I avoid this?

Answer 1

Simple: Don’t start the BackgroundWorker twice.

You can check if it is already running by using the IsBusy property, so just change this code:

worker.RunWorkerAsync(); 

to this:

if( !worker.IsBusy )     worker.RunWorkerAsync(); else     MessageBox.Show('Can't run the worker twice!'); 

Update:

If you do actually need to launch multiple background tasks at the same time, you can simply create multiple BackgroundWorker objects