Force redraw before long running operations

Posted by Joshua on Stack Overflow See other posts from Stack Overflow or by Joshua
Published on 2011-11-14T21:50:31Z Indexed on 2011/11/15 1:52 UTC
Read the original article Hit count: 252

When you have a button, and do something like:

Private Function Button_OnClick

    Button.Enabled = False

    [LONG OPERATION] 

End Function

Then the button will not be grayed, because the long operation prevents the UI thread from repainting the control. I know the right design is to start a background thread / dispatcher, but sometimes that's too much hassle for a simple operation.

So how do I force the button to redraw in disabled state? I tried .UpdateLayout() on the Button, but it didn't have any effects. I also tried System.Windows.Forms.DoEvents() which normally works when using WinForms, but it also had no effect.

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