c# - Graphics.FillRectangle() didn't work -

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graphics gp = graphics.fromhwnd(p2ppic.handle);  solidbrush sb = new solidbrush(color.dodgerblue);  lock (gppalette) {      gpp.fillrectangle(sb, arectangle); }

p2ppic picturebox object in c#; these main code ,and code run, did not take effect can tell me why?

depends have placed code. picturebox own painting.


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