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    <p>THis is by design. This is a coding error, not a runtime error. THe developers of Winforms decided that from .Net 2, they would implement code to check for the cross thread code and then fire an MDA. The MDA isn't an exception though, it's a check for badly designed code.</p> <p>Additionally the MDA doesn't fire when your code is in release mode, it will just randomly fail every so often, the MDA is to help you at test, not during release.</p> <p>I'm assuming that you are rewriting a badly written application to invoke onto the threads and you were hoping that the exceptions would catch for you, I have a suggestion:</p> <p>Update your event handlers for GUI stuff to look like so:</p> <pre><code>public void button_clicked_handler(object sender, EventArgs e) { if(this.InvokeRequired) { this.Invoke(delegateToThisMethod) } else { //perform method } </code></pre> <p>This pattern will catch all your methods and make it seamless for cross thread ops. If the threads are directly accessing code, this is a little tougher. You can get around this by renaming a control, then creating a property to the control, where you can then apply the invoke pattern to it. I've had to do this to troubleshoot some very funky cross thread stuff before.</p> <p>Good luck ;)</p> <p>EDIT: Just wanted to clarify that checking the synchronisation context of the current thread and the Win Forms thread is a costly operation. Thus the reason they implemented the MDA is so that you find it in debug but that your release mode code isn't slowed down on EVERY access to EVERY property or method of a windows forms control.</p>
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    1. PO'Cross-thread operation not valid' does not kill WinForms application (and it should)
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    1. PO'Cross-thread operation not valid' does not kill WinForms application (and it should)
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    1. COWhat is 'MDA'? And do you have any references to 'by design'? Let me repeat myself: I know that I should use 'Control.BeginInvoke'. And I think that when I forget to use it application should 'fail fast', not swallow the exception.
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      1. USAlexander Abramov
    2. COOk, after you mentioned debug mode, I found reference to it on MSDN, thank you.
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    3. COI knew it was buried somewhere in MSDN. Well done for putting the info into the question, lots of people don't realise that SO is designed as a repository of useful answers, maintenance like that is what makes this site great. Good luck with your debugging, nothing like reading someone elses code :)
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