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    <p>It is protected because DGV inherits the property from Control. And Control.DoubleBuffered is protected. Which makes sense because each derived control should decide for itself to turn that on. And it doesn't make sense for the control user to arbitrarily turn it on or off. The DGV designers decided for off.</p> <p>One reason they might have decided that is that double buffering actually makes painting slower. The extra step to render the buffer bitmap costs time. It just looks faster to the human eye, you observe the bitmap suddenly appearing. You can't see the time it takes to draw into the bitmap. Unless other controls need to be painted and they get their turn after the DGV, then it is quite visible.</p> <p>What you see is the form getting drawn first, with holes where the controls go. Those holes have a white background. Black when you use the TransparencyKey or Opacity property. Each control then gets the Paint event and the holes are filled one-by-one. That effect is perceived as flicker too by the user, although it is a different kind of flicker from the one that DoubleBuffered solves. It is especially noticeable when the background is black.</p> <p>What's needed to solve this problem is that the entire form, with all its controls, is double-buffered. That's not available in Windows Forms. However, Windows XP and later actually support this. Check <a href="http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/aaed00ce-4bc9-424e-8c05-c30213171c2c" rel="noreferrer">this thread</a> to see how that's done. Beware that it can have side-effects as documented in that thread.</p>
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    1. POWhy does the DoubleBuffered property default to false on a DataGridView and why is it protected?
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    1. COInteresting, though in the case of the datagridview, without doublebuffering, it takes 2-3 seconds to redraw the control, but with double buffering, it appears instant
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    2. CObtw, up vote for the answer to the protected portion of the question
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    3. COActually double buffering makes it significantly faster... enough faster that the naked eye can easily tell the difference. I do appreciate this answer in that it may be the most 'correct' thing to do, but it's not nearly as practical as just using reflection to set change the setting on the DataGridView
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      1. USBrandon Moore
 

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