How to solve the “Cross-thread operation not valid” Problem?

Call the ReportProgress method from the worker, and handle the ProgressChanged to update the current state.

Check if invoke is required, then call BeginInvoke. Private void AdjustControls() { if (this. InvokeRequired) { this.

Invoke(new MethodInvoker(this. AdjustControls)); } else { label1. Text = "Whatever"; } }.

I tried this. But it doesn't work. Can yu give me more details.

Thanks in advance! – uhu Jul 19 '10 at 14:47 Sorry my bad, I fixed it up a bit. If AdjustControls takes parameters, for example, if it is an event handler, then you cannot use MethodInvoker, you have to define a delegate for it.

– Kurt Jul 19 '10 at 15:27.

I feel a little weird tooting my own horn here, but you may find some use from the ThreadSafeControls library I wrote for exactly this purpose.

You cannot change controls directly inside a thread which did not create them. You can use an invoke method as shown above, or you can use the BackgroundWorker ProgressChanged event. Code used inside BackgroundWorker DoWork: myBackgroundWorker.

ReportProgress(50); // Report that the background worker has got to 50% of completing its operations. Code used inside BackgroundWorker ProgressChanged: progressBar1. Value = e.

ProgressPercentage; // Change a progressbar on the WinForm.

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