When app runs, window turns white!!???

[trint]

This application has a for loop that calls a large function:
"foreach (string invoice in listBox2.Items)"

and causes the window to turn white and loose view of all control.
How can I keep this from happening?
Thanks,
Trint

 

[Morten Wennevik]

Hi Trint,

If I understand your problem correctly the whiteness is caused by a busy
application not having the time to repaint the controls. To solve this
you could handle the foreach loop in a different thread, keeping the GUI
thread up to speed, or call Application.DoEvents() ever so often inside
your loop to handle any waiting events.

 

[Peter Jausovec]

Hi Trinity,

Run this large function in a new thread.

 

[trint]

Thanks, I will try putting in a separate thread.
Trint

 

[Ignacio Machin \( .NET/ C# MVP \)]

hi,

Just be aware that you should access the UI from the worker thread.

cheers,

 

[Jon Skeet [C# MVP]]

<"Ignacio Machin \( .NET/ C# MVP \)" <ignacio.machin AT

Just be aware that you should access the UI from the worker thread.

Just to correct Ignacio's typo:

Just be aware that you should *not* access the UI from the worker
thread.

See http://www.pobox.com/~skeet/csharp/winforms.shtml for more
information.

 

[Ajay Kalra]

As others have pointed out, using a separate worker thread will free up
your main UI thread and your application will become responsive.

I have found the following article by Jason Clark to be helpful in
Windows Forms:

http://msdn.microsoft.com/msdnmag/issues/04/01/NET/

He shows how to use ThreadPool class in a WinForm.