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ADITYA RAOFlag for India

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When should I use OnPaint,OnEraseBkgnd,OnCtlColor,OnDraw

I  am  totally  confused when should I  use  OnPaint,OnDraw,OnCtlColor,OnEraseBkgnd,RedrawWindow
Will  you  please  explain me.When it  will  cause  flicker  and when it will  not?
What  is returning true or false  from Erase background function?
Can any one  brief me  please tomorrow I  have interview over  it.
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Very good answer