Cross thread operation not valid

[satsumatable]

Hi I did code to access my control(text box etc) inside the thread but when i upgrade it into VS 2005 it is saying "cross thread operation not valid" how can fix it ? - Thanks

[sunil2004]

Dear Siva, Is that is happening in debugh mode or it happens in release build also? I also face the same problem while debugging the application :( but it works fine in release build. Regards, Sunil Tonger

[blackjack2150]

Control.CheckForIllegalCrossThreadCalls = false; Put this line in the constructor of your form.

[lmoelleb]

Yes, when you are doing something referred to as "Illigal" then obvious choice is to disable the check so you can get on with your high quality code. X| Look at Invoke and BeginInvoke. Yes, they are annoying, but not half as annoying as the deadlocks you get when not using them.

[satsumatable]

Control.CheckForIllegalCrossThreadCalls = false; will this cause any issues? I have code in 2003 which access controls inside thread and so far it is going good. I placed this command in 2005 and tried it already and it looks OK, i want to make sure by making this "CheckForIllegalCrossThreadCalls" as false will not cause any serious issues. Do you think? http://www.codeproject.com/csharp/threadsafeforms.asp[^] this should be the right choice but lot of rework :)

[Hessam Jalali]

just use delegate for invoking them Here is my code and it's work fine in vs2005

public delegate void CrossThreadHandle(object arg);

    void SetLabelStatus(object txt)
    {
        this.labelDownloadStatus.Text=txt as string;
    }


    void dl\_StatusChanged(Downloader sender, Downloader.DownloadStatus status)
    {
       CrossThreadHandle dLabel=new CrossThreadHandle(this.SetLabelStatus);
        this.Invoke(dLabel,sender.Status.ToString());

        Application.DoEvents();
    }

Hope it would Help

[lmoelleb]

Of course setting the option to false will cause issues. Microsoft did not add a random unneeded check just for the fun of it. Typical behaviour will be random hanging your entire GUI. This can happen on all systems, or just a few. It can also appear to be working fine, then suddently start hanging due to an update from Microsoft, a new OS, or whatever.

[Vasudevan Deepak Kumar]

http://www.codeproject.com/useritems/AccessControlFromThread.asp[^]

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