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C#: problem in concept, mouse crossbar esque thingy

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Hello, The problem is, I just had a serious brain fart. I am directly ownwer drawing a window (the client portion). I am responding to WM_PAINT by redrawing the window completely. This includes background, page, and rulers. Now, I wanted to include markers on the rulers where your crossbars are, so I respond to mousemove events by drawing the crossbars on the rulers. Here is the problem, whats the best way to remove the previous marking (crossbar), or a special way to draw the markers, as to prevent this from happening? The lines just keep drawing, but never erase previously, if I redraw the rulers each mouse move, it goes too slow (obviously). Thanks.

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